mineral

Angelite

Anhydrite (Calcium Sulfate, CaSO4)

Hardness: 3.5 on Mohs scale; Color: Pale blue to sky blue; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Cleavage: Perfect in three directions; Specific Gravity: 2.9–3.0.

Hardness: 3
Color: Pale blue to sky blue
Luster: Vitreous to pearly

Identified May 29, 2026More mineral →

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Physical properties

Hardness: 3.5 on Mohs scale; Color: Pale blue to sky blue; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Cleavage: Perfect in three directions; Specific Gravity: 2.9–3.0.

Formation & geological history

Formed in evaporite deposits where gypsum has been dehydrated over millions of years. This specific blue variety is typically found in sedimentary environments and undergoes high-pressure burial.

Uses & applications

Primarily used for ornamental purposes, carvings, polished gemstones, and metaphysical collection. It is too soft for most industrial construction or high-wear jewelry.

Geological facts

Angelite is the trade name for this blue variety of Anhydrite. It was discovered in Peru in 1987. Because it is anhydrous calcium sulfate, it will turn back into gypsum if soaked in water for extended periods.

Field identification & locations

Identified by its distinctive soft blue color and susceptibility to scratching. It is commonly found in Peru, Germany, and Mexico. Collectors should look for its soapy or waxy feel when polished and its significant weight compared to plastic imitations.