mineral

Angelite

Anhydrite (Calcium Sulfate, CaSO4)

Hardness: 3.5 on Mohs scale; Color: Pale blue to lilac-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 lilac-blue
Luster: Vitreous to pearly

Identified April 29, 2026More mineral →

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Physical properties

Hardness: 3.5 on Mohs scale; Color: Pale blue to lilac-blue; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Cleavage: Perfect in three directions; Specific gravity: 2.9-3.0

Formation & geological history

Formed from the dehydration of gypsum in evaporite basins. This specimen is likely from Peru, where the blue variety is traditionally found in sedimentary layers and volcanic environments.

Uses & applications

Primarily used for ornamental purposes, lapidary carvings, tumbled stones, and as a popular metaphysical or healing crystal. Not suitable for jewelry that faces hard wear due to its relative softness.

Geological facts

Angelite is the gemstone name for a specific blue variety of Anhydrite discovered in Peru in 1987. Because it is anhydrous (without water), if it is soaked in water for too long, it can eventually transform back into gypsum.

Field identification & locations

Identified by its distinctive sky-blue color, waxy to vitreous finish when polished, and its relative lightness. In the field, look for its three-way cleavage that creates rhombohedral fragments. Found mostly in Peru, Mexico, and Libya.