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FINAL EXAM > POLARIZING MICROSCOPE TECHNIQUES AND APPLICATIONS > Flashcards

POLARIZING MICROSCOPE TECHNIQUES AND APPLICATIONS Flashcards

1
Q

Used extensively to examine transparent minerals, fragments, grains and small crystals, as well as thin sections of minerals, rocks and other crystalline aggregates

A

Polarizing Microscope

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2
Q

useful in the determination of the optical properties of individual crystals or aggregates and in the interpretations of textures, structures, growth patterns, and various relationship of natural or artificial substance.

A

Polarizing Microscope

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3
Q

source of light of the microscope

A

Light source

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4
Q

Concentrates light

A

Collector lens system

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5
Q

controls light ray bundle at
the source field

A

Field iris diaphragm with
field iris diaphragm ring

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6
Q

Approximates daylight

note that they only use blue filter before bc the light is yellow

A

Filter mount with blue
filter

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7
Q

used to polarize the light in one direction

A

Polarizer

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8
Q

It controls and illuminates light coming from the source field directed to the object field.

A

Condenser

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9
Q

controls cone of light catering the objective

A

Aperture Iris Diaphragm

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10
Q

It is useful for R. I. determination

A

Aperture Iris Diaphragm

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11
Q

platform for specimen

A

Stage

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12
Q

Fix specimen on stage

A

Stage Clips

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13
Q

Used for point locations and systematic traverse in a species along mutually perpendicular directions

A

Mechanical Stage

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14
Q

Part of the microscope that we
move left to right.

based on discussion

A

Mechanical Stage

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15
Q

the amount of space between the front of the objective and the top of the coverglass, when the specimen is in focus

definition is from google but it was discussed

A

Free working distance

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16
Q

For Focusing Image (moving in cm)

A

Coarse Adjustment Knob

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17
Q

For Focusing Image (moving in mm)

A

Fine Adjustment Knob

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18
Q

holds objectives

A

Revolving Nosepiece

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19
Q

Essential lenses of microscope for magnification and resolution

A

Objectives initial

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20
Q

Magnifications of the Objectives initial

A

4x, 10x, 20x, 40x

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21
Q

for insertion of microscopic
accessory plate

A

Test plate

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22
Q

polarizes light

A

Analyzer

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23
Q

for observing interference
figure

A

Bertrand lens

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24
Q

Holds the eye piece

A

Observation tube

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25
Q

essential lenses of microscope for magnification or resolution conform with objectives

A

Eyepieces with cross hair

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26
Q

for focusing eyepieces

A

Diopter adjustment ring

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27
Q

for camera attachment in
photomicrography

A

Photo Tube

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28
Q

cut to such thickness that it increases or decreases retardation of a section by about 1/4λ (sodium light)

A

mica plate

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29
Q

used to **determine fast and slow directions (electric vectors) of light polarization **in crystals under view on the microscope stage by increasing or decreasing retardation of the light

A

Gypsum plate

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30
Q

ground to produce interference colors from the
beginning of the first to the end of the third or fourth order.

A

quartz wedge

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31
Q

quartz wedge equals to?

A

0.009

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32
Q

Beam of** light consists of a stream of minute particles, or photons,** given off at high velocity by a luminous body that travel through space in straight lines and eventually reach the eye.

A

Corpuscular Theory

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33
Q

The (Dutch) scientist that advanced the Wave Theory

A

Christian Huygens

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34
Q

light to be transmitted by the vibration of particle in the waves

A

Wave Theory

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35
Q

The phenomena of light such as reflection, refraction, diffraction and interference may be readily explained in accordance with this theory

A

Wave Theory

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36
Q

He proposed the Electromagnetic Theory in 1873

A

James Clerk Maxwell

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37
Q

considers light as made up of waves but said that waves are electromagnetic

A

Electromagnetic Theory

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38
Q

A wave consists of rapidly alternating electric and magnetic fields normal to each other and normal to the direction of propagation of light

A

Electromagnetic Theory

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39
Q

Assuming that radiating oscillators in a black body radiate energy discontinuously in units called quanta.

A

Quantum Theory

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40
Q

He proposed the Quantum Theory

A

Planck / Max Planck

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41
Q

The locus of all the points of a medium which receives light wave disturbance simultaneously so that all points are in the same phase.

A

Wave Front

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42
Q

A perpendicular drawn to the surface of a wave front at any direction of propagation of light

A

Wave Normal

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43
Q

Direction in which the light is propagated

A

Ray of Light

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44
Q

It is alway perpendicular to wave front

A

Ray of Light

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45
Q

Wave front always carries light energy in a direction ____________ to its surface

A

perpendicular

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46
Q

A wave normal represents a _________________

A

Ray of Light

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47
Q

The wave normal and direction of propagation of light rays are** perpendicular to the wave front.**

A

Isotropic

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48
Q

The light rays are** not parallel to the wave front.**

A

Anisotropic

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49
Q

May represent a curve combining movement around a circle with motion along a straight line.

A

Displacement

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50
Q

Lies in the wavefront and is perpendicular to the ray in isotropic media.

A

Vibration direction

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51
Q

In ____________, Vibration direction is only perpendicular in limited directions.

A

anisotropic media

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52
Q

Distance between two successive crests or troughs, or any corresponding distance along the wave.

A

Wavelength

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53
Q

Surface determined at a given instant by all parts of a system of waves traveling along the same direction and in the same phase.

A

Wavefront

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54
Q

wavefront is perpendicular only in certain directions in?

A

anisotropic

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55
Q

Direction perpendicular to the wave front

A

Wave Normal

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56
Q

In _________________ the wave normal and ray direction are the same

A

Isotropic

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57
Q

In ______________, they differ aside from certain directions

A

anisotropic

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58
Q

number of vibrations in a given unit of time.

A

Frequency

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59
Q

maximum displacement of a wave from the line of transmission

A

Amplitude

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60
Q

time interval necessary for a wave to undergo a complete oscillation

A

Period

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61
Q

point of the wave with the maximum upward displacement

A

Crest

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62
Q

point of the wave with the greatest downward displacement

A

Trough

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63
Q

a group of light waves following along a sample path

A

Beam

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64
Q

straight-line path followed by light in moving from one point to another

A

Ray

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65
Q

equal to the ratio of the wave-normal velocity in a vacuum to the wave-normal velocity in the medium whether isotropic or anisotropic

A

Refractive index

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66
Q

light of a single wavelength

A

Monochromatic light

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67
Q

lies parallel to the plane of the wavefront.

A

Light vector

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68
Q

In ____________ , Light Vector is perpendicular to the direction of the propagation

A

isotropic

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69
Q

In ______________ , Light vector is still
parallel but not perpendicular to the direction of the propagation.

A

anisotropic

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70
Q

2 Types of Vector

A
  1. electric
  2. magnetic
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71
Q

measures the electrical displacement

A

electric

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72
Q

measures the magnetic displacement or induction.

A

magnetic

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73
Q

Speed of light

A

186,284 miles per second

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74
Q

combination of all the different wavelengths visible to the eye

A

White light

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75
Q

realistic virtual image with a flat field

A

Orthoscopic observation

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76
Q

Setting of Orthoscopic Observation Plane Polarized Light (Uncrossed Nicols)

A
  1. Low to high magnification objective
  2. Analyzer Out
  3. Condenser top lens out
  4. Bertrand lens out
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77
Q

Setting of Orthoscopic Observation (Crossed Nicols)

A
  1. Low to High magnification objective
  2. Analyzer In
  3. Condenser top lens out
  4. Bertrand Lens out
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78
Q

yields interference figures which represent
an optical pattern caused by the behavior of light in individual crystal

A

Conoscopic observation

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79
Q

Setting of Conoscopic Observation

A
  1. High Magnification Objective (40x)
  2. Analyzer in
  3. Condenser top lens in
  4. Bertrand lens in
  5. Accessories in
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80
Q

In sample preparation when cutting using the cutting machine it should be at least ___________ size

A

1’‘x 2’’

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81
Q

In sample preparation when grinding the size should be

A

240 mesh abrasive to 800 mesh

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82
Q

In Heating in sample preparation both ________________________ put Canada Balsam in thin section and heat it for about 30 minutes

A

the thin section and the sample in a hot plate

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83
Q

In Heating in sample preparation both the thin section and the sample in a hot plate put ______________ in thin section and heat it for about 30 minutes

A

Canada Balsam

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84
Q

In Heating in sample preparation both the thin section and the sample in a hot plate put Canada Balsam in thin section and heat it for about ________________

A

30 minutes

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85
Q

In sample preparation when the sample is put in thin section it is called

A

Mounting

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86
Q

Can be used in Cutting in sample prep

A

Diamond saw cutter

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87
Q

Sample can also be grind in a ________________________

A

300 mesh abrasive up to at least 0.03 mm thickness

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88
Q

Cover the thin section with the sample using the ______________

A

Cover Slip

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89
Q

Clean the thin section using the ________________

A

xylol solution

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90
Q

Study of the interaction of light with minerals

A

Optical Mineralogy

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91
Q

Opaque minerals commonly studied in reflected light

A

ore microscopy

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92
Q

general application of optical mineralogy is?

A

to aid in the identification of minerals, either in rock thin sections or individual mineral grains

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93
Q

It has Low power objective (10x) and Bertrand lens is optional

A

Orthoscopic (Uncrossed)

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94
Q

Properties that can be observed in Orthoscopic

A

[] Color and Pleochroism
 Cleavage
 Shape and Form
 Relief/ Refractive Index (R.I.

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95
Q

observed w/ plane prolonged light; not always the same as megacopic color

A

Color

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96
Q

change in color of a mineral in varying degrees as the stage is rotated due to differences in light absorption & extraordinary rays generally expressed as a formula

A

Pleochroism

97
Q

The ability of a mineral to separate into smaller
particles bounded of faces of possible crystal form.

A

Cleavage

98
Q

Cleavage is expressed or best explained in terms of __________

A

direction

99
Q

qualities of cleavage

A

[] Perfect
 Good
 Poor
 None

100
Q

Directions of Cleavage

A

One Direction
Two Directions
Three Directions
Four Directions
Six Directions
All Directions

101
Q

can be expressed by using the terms
euhedral subhedral anhedra

A

Shape and Form

102
Q

Grains that show no recognizable crystal form

A

anhedral

103
Q

Grains that show imperfect but recognizable
crystal form

A

subhedral

104
Q

Grains that show sharp and clear crystal form

A

euhedral

105
Q

degree of visibility of a transparent mineral in an immersion medium

A

Relief

106
Q

A function of the difference n mineral and n medium

A

Relief

107
Q

R.I of Canada balsam

A

1.53

108
Q

index of refraction (R.I) of the mineral is Higher than the medium

A

High Relief

109
Q

R.I of the mineral is lower than the medium

A

Low Relief

110
Q

almost the same with the medium

A

Zero Relief

111
Q

varies as the stage is rotated, takes place if one n mineral is near n balsam, and the other n mineral

A

Change of Relief

112
Q

the contrast between a mineral and its
surroundings due to difference in refractive index.

A

Relief

113
Q

Relief is __________ when the grain has higher refractive index than surroundings

A

positive

114
Q

Relief is __________ when the grain has lower refractive index than surroundings

A

negative

115
Q

Strong negative relief is limited mostly to _____________ like fluorite

A

non-silicates

116
Q

ratio of the velocity of light in a vacuum to its
velocity in the medium

A

Refractive Index

117
Q

R.I. constant velocity in all directions

A

isotropic/ isotropic substances

118
Q

more than one R.I, light velocities vary with direction

A

anisotropic

119
Q

a band or rim of light visible along a grain/crystal boundary in plane-polarized light.

A

Becke line

120
Q

It is best seen using the intermediate power lens (or low power in some cases), on the edge of the grain, with the diaphragm stopped down a bit

A

Becke line

121
Q

If the refractive index is higher than the mounting medium the rays converge towards the ___________ of the grain

A

Center

122
Q

If the refractive index is lower, the rays diverge towards the ______________ of the grain

A

Edge

123
Q

In using Becke line to determine the relief: make sure the polars on the microscope are (1)_________ and you have (2)____________ light

A
  1. Uncrossed
  2. Plane-polarized light
124
Q

In using Becke line to determine the relief:
Pick a grain that has _________ along the edge of the thin section

A

sharp edges

125
Q

In using Becke line to determine the relief:
Focus on _____________ power on the edge of the grain

A

medium power (or lower in some cases)

126
Q

In using Becke line to determine the relief:
Shut the ____________ down a bit

A

Diaphragm

127
Q

In using Becke line to determine the relief:
Slowly, slightly ____________ the distance between the thin section and the objective

A

increase (defocus by lowering the stage)

128
Q

In using Becke line to determine the relief:
You will see 2 thin lines appear along the grain boundary which are?

A
  1. Bright or white Becke line
  2. Dark Becke line
129
Q

If n grain approximately equals the balsam the bright and dark Becke lines are ______________

A

colored

130
Q

Observation of transparent Minerals: Orthoscopic (Crossed)

A
  1. Isotropism & Anisotropism
  2. Interference Colors
  3. Birefringence
  4. Twinning
131
Q

Those w/ uniform physical properties in all directions. It remain dark in all positions even if the stage is rotated.

A

Isotropism

132
Q

Those that display colors in varying degrees as the stage is rotated. It produces interference colors.

A

Anisotropism

133
Q

For anisotropic minerals only. It is observed w/ reference to the color chart (Michel – Levy Chart)

A

Interference colors

134
Q

Vary with the thickness of section, nature of mineral; direction in which the mineral section is cut and the light employed

A

Interference Colors

135
Q

Colors displayed by a birefringent mineral in crossed polarized light

A

Interference Colors

136
Q

Interference Color
Retardation: 0
Order: _____
Color: Black

A

zero

137
Q

Interference Color
Retardation: 0 - 5500
Order: _________
Color/s: ______________
Notes: Neutral Colors are cold, yellow dull

A

Order: First
Colors: Gray, white, Yellow, Red

138
Q

Interference Color
Retardation: ________________
Order: Second
Color/s: _______________
Notes: Purest colors, though not totally pure

A

Retardation: 5500 - 11000
Color/s: Violet through Spectrum to Red

139
Q

Interference Color
Retardation: __________________
Order: __________________
Color/s: Violet through Spectrum to Red
Note: Have a “fluorescent” appearance

A

Retardation: 11000 - 16500
Order: Third

140
Q

Interference Color
Retardation: 16500 and up
Order: Fourth and Higher
Colors: ________________________
Note: Colors become more washed out with increasing retardation

A

Mostly Greens and Pinks

141
Q

The term used in describing interference colors.

A

Order

142
Q

This maximum colour is often diagnostic of an anisotropic mineral

A

Birefringence

143
Q

display simultaneously the maximum and minimum refractive indices.

A

Birefringence

144
Q

Formation of rational symmetry intergrowth of 2 or more grains of crystalline species.

A

Twinning

145
Q

Form of penetration twinning where two
crystals form as penetration twins.

A

Carlsbad Twining

146
Q

common within the plagioclase feldspars, in places where two adjoining twin slabs or lamellae are mutually reversed with respect to each other and every alternate twin ‘plate’ or ‘slab’ has an identical atomic structure

A

Lamellar Twining

147
Q

shows two kinds of repeated twinning in thin section, with one set of twins arranged at 90° to the other set.

A

Cross-hatched twinning

148
Q

Refers to solid solution which do not have uniform composition.

A

Zoning

149
Q

Types of Zoning

A

Normal Zoning
Reverse Zoning
Oscillatory Zoning

150
Q

Types of Zoning where the center is more calcic becoming more sodic toward the margin

A

Normal Zoning

151
Q

Types of Zoning where the center is more sodic becoming more calcic toward the margin.

A

Reverse Zoning

152
Q

Types of Zoning that is normally steplike progressions for more calcic interior to more sodic margins w/ local reversals in adjacent zones

A

Oscillatory Zoning

153
Q

it is when a mineral becomes dark parallel to the crosshairs.

A

Parallel Extinction

154
Q

Extinct at an angle
with the direction of polars

A

Inclined/Oblique

155
Q

planes of mineral to the diagonal; vibration direction is diagonal

A

Symmetrical

156
Q

Observation of Transparent Minerals: Conoscopic to get interference figure

A
  1. High Power Objective (40x)
  2. Condenser top lens in
  3. Analyzer In (Crossed Polars)
  4. Bertrand lens in
  5. Accessories In (Gypsum Plate)
157
Q

Information from Interference Figure

A
  1. Number of Optic Axis
  2. Optic Sign (positive or negative)
  3. Optic Angle (2v)
  4. Dispersion
158
Q

Uniaxial interference Figure
Two arms of the cross form the ____________

A

Isogyres

159
Q

Uniaxial Interference Figure
Interference Colors, identical to those on the color chart, increases in order from the Melatope cutwards

A

Isochromes

160
Q

Uniaxial Interference Figure
The point where the Isogyres cross is where the optic axis emerges in the interference figure

A

Melatope

161
Q

Solution: Alizarine Red S
Mineral: Calcite
Color: ____________

A

Pink Orange

162
Q

Solution: Alizarine Red S
Mineral: Aragonite
Color: ____________

A

Pink Orange

163
Q

Solution: Alizarine Red S
Mineral: Witherite
Color: __________

A

Red

164
Q

Solution: Alizarine Red S
Mineral: Cerussite
Color: __________

A

Mauve

165
Q

Solution: Trypan Blue
Mineral: Calcite
Color: __________

A

Dark Blue

166
Q

Solution: Trypan Blue
Mineral: Dolomite
Color: __________

A

Pale Blue

167
Q

Solution: Silver Chromate
Mineral: Calcite
Color: __________

A

Red Brown

168
Q

Solution: Silver Chromate
Mineral: Aragonite
Color: __________

A

Red Brown

169
Q

Solution: Copper Nitrate
Mineral: Calcite
Color: __________

A

Green/ Bluish Green

170
Q

Solution: Cobalt Nitrate
Mineral: Aragonite
Color: __________

A

Lilac-Purple

171
Q

Solution: Harris Hematoxillin Solution
Mineral: Calcite
Color: __________

A

Lilac

172
Q

Solution: Meigen
Mineral: Aragonite
Color: __________

A

Purple

173
Q

Solution: Meigen
Mineral: Calcite
Color: __________

A

No Change

174
Q

Solution: Rhodizonic Acid
Mineral: Witherite
Color: __________

A

Orange/Red

175
Q

Solution: Rhodizonic Acid
Mineral: Calcite
Color: __________

A

No Change

176
Q

Solution: Tropaeolin
Mineral: Smithsonite
Color: __________

A

Yellow

177
Q

Solution: Tropaeolin
Mineral: Magnesite
Color: __________

A

No Change

178
Q

Solution: Hydrogen Peroxide - Potassium Hydroxide
Mineral: Ankerite
Color: __________

A

Orange

179
Q

Solution: Hydrogen Peroxide - Potassium Hydroxide
Mineral: Siderite
Color: __________

A

Brown

180
Q

Solution: Lemberg Hydroxide
Mineral: Calcite
Color: __________

A

Pale Brown

181
Q

Solution: Benzidene
Mineral: Rhodochrosite
Color: __________

A

Blue

182
Q

Solution: Potassium Ferricyanide
Mineral: Anhydrite / Gypsum
Color: __________

A

Yellow

183
Q

Solution: Potassium Ferricyanide
Mineral: Rhodochrosite
Color: __________

A

Pale Brown

184
Q

Solution: Potassium Ferricyanide
Mineral: Dolomite
Color: __________

A

Blue

185
Q

Solution: Organic Dye Titan Yellow
Mineral: Dolomite
Color: __________

A

Dark Orange Red

186
Q

Solution: Organic Dye Eosin Y
Mineral: Dolomite
Color: __________

A

Dark Pink

187
Q

Solution: Organic Dye Congo Red
Mineral: Dolomite
Color: __________

A

Red

188
Q

Solution: Organic Dye Alizarine Red
Mineral: Dolomite
Color: __________

A

Lilac

189
Q

Solution: Feigl Solution
Mineral: Aragonite
Color: __________

A

Black

190
Q

Solution: Sodium Cobaltinitrite
Mineral: K-felds
Color: __________

A

Yellow

191
Q

Solution: Sodium Cobaltinitrite
Mineral: Plagioclase (Except Albite)
Color: __________

A

Red

192
Q

Solution: Kirchberg
Mineral: Ankerite
Color: __________

A

Gray to Black

193
Q

Solution: Kirchberg
Mineral: Siderite
Color: __________

A

little coloring

194
Q

Solution: Magneson
Mineral: Smithsonite (removed after washing)
Color: __________

A

Slightly Blue

195
Q

Solution: Magneson
Mineral: Magnesite (Steps after washing)
Color: __________

A

Dark Blue

196
Q

The identification or interpretation of framework mineralogy and textures leading to classification of wallrock as sedimentary, metamorphic or igneous

A

Petrography

197
Q

Identification of replacement mineralogy and paragenesis and interepretation in terms of histories of diagenesis, metamorphism, hydrothermal alteration and/or weathering

A

Petrography

198
Q

refers to degree of crystallinity, grain size or granularity, and the fabric or geometrical relationship between the constituents of a rock.

A

Texture

199
Q

what are the Degree of crystallinity

A

Holocrystalline
Holohyaline
Hypocrystalline/Merocrystalline

200
Q

consist wholly of crystals

A

Holocrystalline

201
Q

consist entirely of glass

A

Holohyaline

202
Q

Contain both crystals and glass

A

Hypocrystalline/Merocrystalline

203
Q

Extremely minute, incipient crystals, provided they are birefringent.

A

Microlites

204
Q

Smaller, spherical, rod- and hair-like isotropic from.

A

Crystallite

205
Q

Fine Grained

A

Aphanitic or Eucrystalline

206
Q

Coarse Grained

A

Phaneritic or Dyscrystalline

207
Q

Very-fine and undistinguishable under petrographic microscope

A

Cryptocrystalline

208
Q

Very-coarsed grained

A

Pegmatitic

209
Q

Crystals were bounded completely by crystal faces.

A

Euhedral / Idiomorphic / Automorphic

210
Q

Crystals were not bounded by crystal faces.

A

Anhedral / Allotriomorphic / Xenomorphic

211
Q

Crystals were partially bounded by crystal faces

A

Subhedral / Hypidiomorphic

212
Q

Chiefly minerals are anhedral.
and are common in aplites

A

Allotriomorphic Granular/ Xenomorphic Granular/ Aplitic / Sugary/ Saccharoidal

213
Q

chiefly minerals are euhedral and are common in dark hypabyssal rocks or lamprophyres

A

Panidiomorphic Granular/ Automorphic Granular / Lamprophyric

214
Q

all faces are present

A

Hypidiomorphic Granular/ Hypautomorphic Granular/ Granitic

215
Q

When one mineral is surrounded by another mineral, the enclosing mineral is the _______________

A

younger

216
Q

Early crystals are generally ___________ or at least more nearly than those of later crystals

A

Euhedral

217
Q

If both large and small crystals occur together, the ________ one are the first to develop

A

larger

218
Q

phenocrysts lie in a matrix of glass.

A

Vitrophyric Texture

219
Q

the groundmass is a dense intergrowth of quartz and feldspar.

A

Felsophyric Texture

220
Q

the groundmass of feldspar are rectangular in form instead of slender lath crystals

A

Orthopyric Texture

221
Q

porpyritic texture in which phenocrysts are clustered into aggregates called glomerocrysts or crystal clots. It is common and often included plagioclase and pyroxenes in basic rocks.

A

Glomeroporphyritic Texture

222
Q

Process where accumulation of crystals occur by surface tension and fixing by interpretation due to crystal growth

A

Synneusis

223
Q

an important consideration in crystal fractionation by crystal settling

A

Glomerocrysts

224
Q

Refers to crystals, typically phenocrysts, in an igneous rock which contain small grains of other minerals.

A

Poikilitic Texture

225
Q

A variant the Poikilitic texture, is one where random plagioclase laths are enclosed by pyroxene or olivine.

A

Ophitic Texture

226
Q

A variant the Poikilitic texture,** plagioclase is larger and encloses the ferromagnesian minerals.**

A

Sub-ophitic

227
Q

Angular interstices between feldspars filled with glass instead of pyroxene

A

Hyalophitic Texture

228
Q

A genetic term for a border of secondary minerals formed at the margin of a primary grain in an igneous or metamorphic rock.

A

Corona Texture/ Reaction Rim /
Opacitic Rim

229
Q

Secondary rim/coronas

A

Kelyphitic Rim

230
Q

a textural term indicating that** a crystal occupies the angular space between at least two larger crystals.**

A

Intergranular Texture

231
Q

A textural term used to denote that the angular spaces between larger crystals is occupied by glass, or glass and small crystals.

A

Intersertal Texture

232
Q

Texture of the groundmass of a holocrystalline igneous rock in which** lath-shaped microlites (typically plagioclase) are arranged in a glass-free mesostasis** and are** generally interwoven in irregular unoriented fashion**.

A

Pilotaxitic Texture

233
Q

A texture of extrusive rocks in which the groundmass contains little volcanic glass and consists predominantly of minute tabular crystals, namely, sanidine microlites.

A

Trachytic Texture

234
Q

An intergrowth of branching rods of quartz set in a single crystal of plagioclase, neighboring rod of quartz have the same lattice orientation and extinguish together.

A

Myrmekitic Texture

235
Q

________________ commonly exhibits a variety of disequilibrium textures in volcanic rocks, especially in orogeny andesites

A

Plagioclase

236
Q

common in plagioclase or in pyroxene crystals in extrusive volcanic rocks and is interpreted as the result of mixing processes

A

Sieve Texture

237
Q

A process by which a solid solution phase unmixes into two separate phases in the solid
state.

A

Exsolution

238
Q

an intimate intergrowth of sodic and potassic feldspar resulting from subsolidus exsolution

A

Perthitic Texture

239
Q

an intergrowth arising due to exsolution where potassic feldspar is present as blebs or lamellae within a sodic feldspar.

A

Anti-PerthicTexture

FINAL EXAM (8 decks)

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