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Rock Identification Test > non silicates - oxides > Flashcards

non silicates - oxides Flashcards

1
Q

which oxides are most likely to come up in the exam? (so you should probably know)

A
  1. magnetite
  2. illmentite
  3. heamatite
  4. Chromite
  5. spinel
  6. geothite
  7. manganite
  8. cuprite
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2
Q 
identify the following mineral:
habit:
- subhedral and individual grains usually difficult to see
lustre:
- metallic 
hardness:
-5/6
clevage: 
- none 
additional properties:
- weak magnetism
Colour:
Silver
Streak: pale silver
A

illmenite

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3
Q

what are the diagnositc properties of illmentie?

A
  1. no clevage
  2. weak magnetism
  3. pale grey streak
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4
Q 
identify the following mineral: 
habit:
- anhedral
colour:
- red to reddish brown 
streak colour:
- red 
hardness:
- 5/6
lustre:
- earthy/dull
Cleavage:
- none 
other proeprties:
- weak magnetism
A

heamaite

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5
Q

what are the diagnostic properties of heamatite?

A

RED STREAK COLOUR and weak magnetism

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6
Q 
identify the following mineral:
habit:
- bladed subhedral
colour:
- green/dark grey but lighter than other oxides 
streak:
- dark brown/black
lustre:
- metallic 
clevage:
-none 
Hardness:
- 5/6
A

chromite

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7
Q 
identify the following mineral: 
habit:
-anhedral massive 
colour:
- black but could have red/brown due to oxidation of iron 
streak:
- dark grey/black
lustre:
-greasy/earthy
hardness:
-5/6
clevage:
-none 
other properties:
- strong magnetism
A

magnetite

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8
Q

what us THE diagnostic property of magnetite?

A

its strong magnetism

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9
Q

what are the identifiable properties of spinel?

A

black with lighter speckles/spots

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10
Q

which hydroxide can be identified by its botryoidal aggregation?

A

geothite

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11
Q 
identify the following mineral:
habit:
- acicular 
aggregation:
-radial 
colour:
dark grey
weak magnetism
A

manganite

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12
Q

corundum is anothe oxide that i couldnt find a specimne of. what does it look like?

A

its got black square crystals (so cubic habit) and is in a bigger white rock. it will be VERY HARD

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13
Q

how would you identify cuprite?

A

it has a very strong metal smell.
red to black colour
very reflective in cavities

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14
Q 
Identify the following lab specime:
Habit: 
- equant/isometric 
Aggregation:
- Botryoidal (specific specimine)
Colour:
Dark grey (almost like a pencil)
Streak colour:
- distinctive pale yellow streak 
Hardness:
- 7/8 (scratches the quartz glass)
Lustre:
- silky 
Cleavage:
- none visible with the Botryoidal aggregation
A

Goethite

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15
Q

An oxide leaves a very pale streak colour, what is it?

A

Goethite

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16
Q

What does the corundum lab sample look like?

A

It is literally a white rock with some small black square shaped crystals in it (these being the corundum

17
Q 
Identify the following oxide:
Habit:
- square shaped/cubic 
Aggregation:
-granular 
Colour:
A purplish/brown/black is colour 
Streak:
- no streak 
HardnesS:
- 9/10 (scratches the quartz glass)
Lustre:
- greasy
A

Corundum - the hardness should be the identifier

18
Q

Some of the oxide samples have a very generalised/ similar appearance. What is this?

A

They are dark with fine grained crystals that almost sparkle within the rock matrix

19
Q 
Identify the follwing mineral:
Habit:
- non visible due to massive aggregation 
Lustre:
- metallic greasy lustre 
Hardness:
- 3/4
Colour:
- dark grey 
Additional proeprties: 
- very weak magnetism 
No cleavage visible, doesn’t mean its not there
A

Chromite

20
Q 
Identify the following oxide: 
Habit:
- massive to individual grains not visible 
Aggregation:
-massive
Colour:
- pale red colour 
Streak colour: 
- brown/red streak colour 
Hardness:
- 3/4 Scratched by steel nail 
Lustre:
- earthy/dull
A

BAUXITE - this is a hydroxide

21
Q

Magnetite and bauxite both leave a distinct red/brown streak colour. How would you distinguish between the two?

A

Their actual colour. Heamatite id dark wheras bauxite is a red rock

22
Q

Illmenite are VERY similar to one another. How can you tell them apart?

A

Illmenite looks a lot more “greasy” than chromite, whereas chromite looks more like a black rock with induvidual shiny grains in it

23
Q

What properties would allow you to identify spinel?

A
  • dark grey colour
  • leaves dark brown streak
  • hardness 3/4 (scratched by the quartz glass)
    Has very weak lustre
24
Q

What is one of the diagnostic properties of spinel?

A

It leaves a dark brown streak

25
Q

How do you distinguish between Illmenite and chromite?

A

The lustre- Illmenite has a metallic lustre whereas chromite does not

Rock Identification Test (14 decks)

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