mineral
Angelite
Anhydrous Calcium Sulfate (CaSO4)
AI-generated identification · may be incorrectHardness: 3.5 on Mohs scale; Color: Pale blue, grey-blue; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific Gravity: 2.97
- Hardness
- 3
- Color
- Pale blue, grey-blue
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3.5 on Mohs scale; Color: Pale blue, grey-blue; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific Gravity: 2.97
Formation & geological history
Formed in evaporite deposits where gypsum has been dehydrated by pressure and temperature. Primarily found in sedimentary basins and salt domes.
Uses & applications
Commonly used for lapidary work including tumbled stones, carvings, and cabochons for jewelry. Popular in metaphysical circles.
Geological facts
Angelite is a trade name for a blue variety of Anhydrite. It was first discovered in Peru during the late 20th century. It is chemically identical to gypsum but lacks water in its crystal structure.
Field identification & locations
Identified by its distinctive soft blue color and susceptibility to scratching by a copper penny or steel nail. It should never be stored in water as it will rehydrate and transform into gypsum.
