mineral
Blue Celestite
Strontium Sulfate (SrSO4)
Hardness: 3-3.5 (Mohs scale), Color: Sky blue to colorless, Luster: Vitreous to pearly, Crystal structure: Orthorhombic, Cleavage: Perfect, Specific gravity: 3.9-4.0
- Hardness
- 3-3
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Physical properties
Hardness: 3-3.5 (Mohs scale), Color: Sky blue to colorless, Luster: Vitreous to pearly, Crystal structure: Orthorhombic, Cleavage: Perfect, Specific gravity: 3.9-4.0
Formation & geological history
Forms in sedimentary rocks such as limestones and dolomites, or in evaporite deposits. It often forms inside geodes or as fibrous veins.
Uses & applications
Main source of Strontium used in fireworks, tracer bullets, and glass manufacturing; also highly valued for metaphysical collections and ornamental display.
Geological facts
The name is derived from the Latin word 'caelestis' meaning celestial or heavenly, referring to its distinct sky-blue color. The largest celestite geode in the world is found in Put-in-Bay, Ohio.
Field identification & locations
Commonly identified by its light blue color, high density (heavy for its size), and tabular or prismatic crystals. Madagascar is the most famous location for top-quality blue clusters.
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