mineral

Celestite (Celestine) Druze on Agate/Host Rock

Strontium sulfate (SrSO4)

Hardness: 3 - 3.5 on Mohs scale; Color: Pale blue to sky blue; Luster: Vitreous (glassy); Crystal structure: Orthorhombic; Cleavage: Perfect in three directions; Specific gravity: 3.9 - 4.0.

Hardness: 3 - 3
Color: Pale blue to sky blue
Luster: Vitreous (glassy)

Identified July 5, 2026More mineral →

Explore Celestite (Celestine) Druze on Agate/Host Rock in the encyclopedia →

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Physical properties

Hardness: 3 - 3.5 on Mohs scale; Color: Pale blue to sky blue; Luster: Vitreous (glassy); Crystal structure: Orthorhombic; Cleavage: Perfect in three directions; Specific gravity: 3.9 - 4.0.

Formation & geological history

Formed in sedimentary rocks, primarily in evaporated deposits (evaporites) or hydrothermal veins. Often found within geodes where strontium-rich fluids precipitate over long periods. Geologically widespread, often from the Phanerozoic eon.

Uses & applications

Primary source of Strontium for pyrotechnics (red fireworks/flares) and glass manufacturing. Highly valued as a decorative collector's specimen and in metaphysical practices.

Geological facts

The name is derived from the Latin word 'caelestis', meaning celestial, referring to its sky-blue color. The largest celestite geode ever discovered is 35 feet wide, located in Ohio, USA.

Field identification & locations

Identify in the field by its high density (feels heavy for its size), distinct blue tint, and orthorhombic crystal habit. Common locations include Madagascar (most commercial specimens), Sicily, and Lake Erie region.

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