Lab 1 (mineral and rock ID)

Question 1

adamantine

Answer 1

the luster of a diamond (refractive)

Question 2

vitreous

Answer 2

piece of polished glass

Question 3

resinous

Answer 3

resin, grainy

Question 4

greasy

Answer 4

oily

Question 5

pearly

Answer 5

iridescent sheen

Question 6

silky

Answer 6

silk or satin

Question 7

earthly

Answer 7

dull

Question 8

density (p)

Answer 8

mass/unit volume
unit: g/cm3 or kg/cm3

Question 9

specific gravity (G)

Answer 9

ratio of a density of material to the density of water (at 4°C)
P Mineral/P H2O

Question 10

felsic (light)

Answer 10

white, pink, light gray

Question 11

felsic minerals

Answer 11

> 5% quartz
alkali feldspar > plagioclase
mica (muscovite)
15% ferromagnesian minerals

Question 12

intermediate

Answer 12

grayish (mix of light and dark material)

Question 13

intermediate minerals

Answer 13

<5% quartz
plagioclase > alkali feldspar
amphibole
biotite
15-40% ferromagnesian minerals

Question 14

mafic (dark)

Answer 14

black, dark grey, dark green

Question 15

mafic minerals

Answer 15

no quartz
(ca- rich) plagioclase = 50%
no alkali feldspar
olivine
pyroxene
40% ferromagnesian minerals

Question 16

ultramafic

Answer 16

very dark or greenish
nearly 100% ferromagnesian minerals

Question 17

extrusive

Answer 17

small crystals

Question 18

intrusive

Answer 18

large crystals

Question 19

phaneritic

Answer 19

coarse grained rock (large crystals)

Question 20

aphanitic

Answer 20

fine grained rock (small crystals)

Question 21

porphyritic

Answer 21

large crystals mixed with small crystals (ground mass)

Question 22

glassy

Answer 22

looks like glass, small crystals