non silicates - sulfates Flashcards

1
Q

which sulfates do you need to know for the exam?

A
  1. anhydrite
  2. gypsum
  3. Chalcoalumite
  4. Barite
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2
Q
identify the following mineral: 
habit:
- acicular 
aggregation:
- granular, cab be radial 
colour:
- white/clear 
- white streak 
lustre:
- silky/pearly
 cleavage: 
- three directions 
- one well developed, the other two poor 
hardness: 
2
A

gypsum

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3
Q
gypsum and halite share the follwing properties:
hardness: 2 
Colour: white/transparent 
cleavage: three directions. 
how could you tell them apart?
A
  • halite tastes like salt

- gypsum has acicular habit whereas halite has cubic

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4
Q
identify the following mineral:
habit:
- prismatic/elongated 
colour:
-white
-no streak
lustre:
-greasy, vitreous, pearly
clevage:
- three when well formed
A

anhydrite

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5
Q

anhydrite and gypsum can appear VERY similar, how would you distinguish between the two?

A

the hardness, as anhydrite has a hardness 3/4 whereas gypsum has a hardness 2

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6
Q

what does the barite specimine look like and which group does it belong to?

A

rosy pink to white with sheets going in one clear direction.

sulfates

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