mineral
Celestine (or Celestite)
Strontium sulfate (SrSO4)
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
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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 by precipitation from strontium-rich groundwater. Most commonly found in geodes within limestone or evaporating salt deposits.
Uses & applications
Primary source of Strontium for fireworks (red flames) and metallurgy; also popular as a decorative display mineral for collectors.
Geological facts
The world's largest geode, the Crystal Cave in Ohio, is composed entirely of giant Celestite crystals measuring up to 3 feet long.
Field identification & locations
Identify by its pale blue hue, high density relative to its size, and delicate tabular or blocky crystal habits. Major deposits are in Madagascar.
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mineral