mineral
Celestite
Celestine (SrSO4)
AI-generated identification · may be incorrectHardness: 3-3.5 (Mohs scale); 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
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Physical properties
Hardness: 3-3.5 (Mohs scale); Color: Pale blue to colorless; Luster: Vitreous to pearly; Crystal Structure: Orthorhombic; Cleavage: Perfect; Specific Gravity: 3.9-4.0
Formation & geological history
Formed as a sedimentary evaporite mineral or through hydrothermal activity. Often found in geodes within limestone or dolostone, particularly from the Mesozoic era.
Uses & applications
Main source of strontium used in fireworks, tracer bullets, and glass manufacturing; also highly valued by mineral collectors and for metaphysical use.
Geological facts
The world's largest known geode is a celestite geode located in Ohio, USA, measuring 35 feet deep. Its name is derived from the Latin 'caelestis', meaning celestial, referring to its sky-blue color.
Field identification & locations
Identify by its distinct pale blue color, high density (heavy for its size), and lack of reaction to acid. Common in Madagascar, USA (Ohio, Michigan), and Poland.
