Gypsum
Physical Properties
| Color | white |
| Form/Habit | massive |
| Lusture | pearly |
| Streak | white |
| Hardness | 2 |
| Cleavage | 3 sets |
| Fracture | sub conchoidal |
| Specific Gravity | 2.32 (low) |
| Chemical Composition | CaSO4.2H2O |
| Crystal System | monoclinic |
| Diagnostic Properties | hardness of 2, 3 sets of cleavage, sub conchoidal fractures |