Gypsum
UNB-2017-0080Minerals » Sulphates
Description
Large colourless untwinned crystal of Gypsum with a vitreous and pearly lustre.
Gypsum (CaSO4 x 2H2O) can be white, colourless, grey, yellow, red or brown in colour with a vitreous lustre that can be pearly on the cleavage. Streak is white and hardness is 1 1/2 to 2. Cleavage is perfect in one direction and distinct in two other directions. Gypsum is usually found as untwinned single crystals that show rhombic forms but can also be twinned arrowhead shapes with beveled edges, granular, massive, fibrous (Satin Spar) or earthy in form.
Specifications
| Object name | Gypsum |
|---|---|
| ID | UNB-2017-0080 |
| Legal status | Permanent collection |
| Category | Mineral |
| Classification | Mineral group: Sulphates |
| Origin | West Bridgford, Nottingham, England, United Kingdom |
| Pieces | 1 |
| Partial | No |
| Measurements |
|
Map of Origin
Publications
- Chesterman, C.W. 1979. Audubon Society, Field Guide to North American Rocks and Minerals. Knopf.