Gypsum
Last modified by Roelof Zwaan on 2021/09/30 15:18
Gypsum is the most common sulfate mineral and differs from anhydrite in its water content. Gypsum has two water molecules attached to its sulfate molecules giving the following chemical name: CaSO4*2H2O. The mineral can be found in deposits together with halite, anhydrite, sulfur, calcite and dolomite.
Characteristics
Gypsum is clear colorless or clear white when pure. Impurities produce gray, yellow, red or brown. Its streak is white and gypsum has a vitreous, silky, sugary luster. Its hardness is soft, a 2 on Mohr's scale. It can be recognized by its perfect cleavage, low hardness and low specific gravity.
References
- Bonewitz, Ronald Louis (2012). Rocks and Minerals. DK Publishing. p. 110. ISBN 978-0-7566-9042-7.
Gypsum
| Type | Salt stone |
|---|---|
| Chemical formula | CaSO4 *2 H2O |
| Color | clear colorless or clear white |
| Streak | White |
| Luster | Vitreous, silky and sugary |
| Hardness | Soft |
| Cleavage | Perfect |
| Image |
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