Gypsum
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| Frequency | uncommon |
|---|---|
| Hardness | 2 |
| Density | 2.3 |
| Chemical Formula | CaSO4.2 H2O |
Gypsum is a mineral composed primarily of calcium sulfate and structural water. If heated to 300F to drive off the structural water, it becomes annhydrite, which is composed almost exclusively of calcium sulfate. Annyhdrite is used as a setting agent in many lime-based materials.