|Mineral class||Sulphates : Anhydrite - Gypsum group.|
|Habitus||Tabular or elongated crystals. Aggregates in the form of roses are called desertroses. Also radiating fibric aggregates. Twinning is common in the form of swallow tails. Grainy or compact aggregates are also common.|
|Cleavage||Perfect, creating thin fragments.|
|Color||White to yellowish white.|
|Luster||Vitreous to pearly. Transparent to translucent.|
|Occurance|| In evaporite deposits or deposits around hot springs.|
In Sweden the main occurance is in old mine dumps and mineshafts. A product from oxidised pyrite.
|Notes|| Transparent crystals and fragments are called selenite.|
Dense banded varietys are called alabaster.
Soluble in hydrochloric acid and hot water.
Could show fluorescens.
|Locations|| Common on old mine dumps at sulphide mines. |
| To sulphates index.
|| Mineral group index.
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