The anhydrite in gemstone is excessively rare.
To learn more about the mineralogy of the anhydrite, see mindat.org
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Anhydrite
- Translations : 硬石こう
- Etymology : From the greek"anhydros" άνυδρος = without water.
- Discovery: 1804 by Werner
- Type localitySalt Mine, Hall valley, Hall, Innsbruck, Inn valley, North Tyrol, Tyrol, Austria
- Comment : The anhydrite in gemstone is excessively rare.
Gemological data
- Chemical formula : CaSO4
- Hardness (Mohs) : 3 - 3.5
- Density : 2.95 - 2.98
- Refractive index : 1.56 - 1.61
- Crystal system : Orthorhombic
- Mineralogical Class : Sulfates
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anhydrite - Iran
