mineral

Celestine (Celestite)

Celestine (Strontium Sulfate, SrSO4)

AI-generated identification · may be incorrect

Hardness: 3-3.5 (Mohs); Color: Pale blue to colorless; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Cleavage: Perfect; Specific Gravity: 3.9-4.0

Hardness: 3-3
Color: Pale blue to colorless
Luster: Vitreous to pearly

Identified July 20, 2026More mineral →

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Physical properties

Hardness: 3-3.5 (Mohs); Color: Pale blue to colorless; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Cleavage: Perfect; Specific Gravity: 3.9-4.0

Formation & geological history

Formed in sedimentary rocks como geode fillings or replacement crystals; commonly associated with gypsum, anhydrite, and halite. Most prominent specimens are from the Jurassic and Cretaceous periods.

Uses & applications

Primary source of strontium for fireworks (red color) and metal alloys; widely used in crystal healing and geological mineral collections.

Geological facts

The name is derived from the Latin 'caelestis', meaning celestial, referring to its sky-blue color. The largest celestine geode in the world is 35 feet deep and located in Ohio.

Field identification & locations

Identify by its pale blue hue, high density for its size, and brittle crystals. Notable locations include Madagascar, Sicily, and the Sylvania region in Ohio.