non silicates - sulfates Flashcards
1
Q
which sulfates do you need to know for the exam?
A
- anhydrite
- gypsum
- Chalcoalumite
- Barite
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
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
4
Q
identify the following mineral: habit: - prismatic/elongated colour: -white -no streak lustre: -greasy, vitreous, pearly clevage: - three when well formed
A
anhydrite
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
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