mineral

Celestine

SrSO4

AI-generated identification · may be incorrect

Hardness 3-3.5 on the Mohs scale, vitreous to pearly luster, orthorhombic crystal structure, often found in tabular or prismatic crystals. Color is typically pale blue, white, or colorless.

Identified August 12, 2026More mineral →

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Physical properties

Hardness 3-3.5 on the Mohs scale, vitreous to pearly luster, orthorhombic crystal structure, often found in tabular or prismatic crystals. Color is typically pale blue, white, or colorless.

Formation & geological history

Forms in sedimentary rocks, particularly dolomites and dolomitic limestones, often associated with evaporite deposits. Can also be found in hydrothermal veins.

Uses & applications

Principal source of strontium, used in fireworks, flares, and various industrial applications. Attractive specimens are highly valued by collectors.

Geological facts

The name comes from the Latin 'caelestis' meaning celestial, due to its common pale blue color. The world's largest known geode is a celestine geode located in Ohio.

Field identification & locations

Identifiable by its relatively high specific gravity (3.9-4.0), soft hardness, and common pale blue color. Often found in cavities in sedimentary rocks, especially in regions with historic evaporite deposition.