mineral
Blue Celestite
Celestine (Strontium Sulfate, SrSO4)
AI-generated identification · may be incorrectHardness: 3-3.5 (Mohs scale); Color: Pale blue, colorless, white; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Cleavage: Perfect basal; Specific gravity: 3.9-4.0
- Hardness
- 3-3
- Color
- Pale blue, colorless, white
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3-3.5 (Mohs scale); Color: Pale blue, colorless, white; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Cleavage: Perfect basal; Specific gravity: 3.9-4.0
Formation & geological history
Formed as sedimentary deposits in carbonate rocks like limestone or dolostone through the evaporation of seawater, often found in geodes. It can also occur in hydrothermal veins.
Uses & applications
Primary source of the element strontium, used in pyrotechnics (red fireworks), metal alloys, and electronics. Often used as a decorative specimen or in metaphysical practices.
Geological facts
The name is derived from the Latin word 'caelestis' meaning celestial or heavenly, due to its sky-blue color. Madagascar is home to the world's largest Celestite geode.
Field identification & locations
Identified by its heavy weight relative to its size (high specific gravity), its blue color, and rectangular crystal faces. Common in Madagascar, Sicily, and Ohio, USA.
