mineral

Angelite

Anhydrous Calcium Sulfate (CaSO4)

Hardness: 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

Identified July 7, 2026More mineral →

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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.