Gypsum
mineral · common
Quick facts
- Formula
- CaSO4·2H2O
- Hardness
- 2
- Luster
- Pearly to silky
- Colors
- Colorless, white, satin spar
Very soft evaporite. Satin spar and selenite are varieties, not separate species.
Scratched by a fingernail. Often mislabeled as quartz in gift shops.
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