Gypsum Flashcards
1
Q
What is gypsum’s formula?
A
CaSO4x2H2O
2
Q
What is gypsum’s crystal system?
A
Monoclinic
3
Q
What is gypsum’s hardness?
A
2.0
4
Q
What is crystallography of gypsum?
A
three unequal cleavages
swallow-tail twins {100}
perfect {010} cleavage
5
Q
What is gypsum’s 3 occurrences?
A
sedimentary beds in evaporite sequences
veins or scattered masses in clay and shale
gangue in hydrothermal veins
6
Q
What is gypsum’s use?
A
plaster of Paris
