mineral

Celestite Geode

Strontium Sulfate (SrSO4)

Hardness: 3-3.5 on the Mohs scale; Color: Pale blue, white, colorless, sometimes reddish or greenish; Luster: Vitreous to pearly; Crystal Structure: Orthorhombic; Cleavage: Perfect in three directions; Specific Gravity: 3.95-3.97

Hardness: 3-3
Color: Pale blue, white, colorless, sometimes reddish or greenish
Luster: Vitreous to pearly

Identified August 6, 2026More mineral →

Explore Celestite Geode in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed in sedimentary environments, commonly in cavities of limestones, dolostones, and evaporite deposits from the precipitation of strontium-rich marine waters.

Uses & applications

Used primarily as a specimen for mineral collectors, as an ore of the element strontium (used in fireworks and flares), and in metaphysical practices.

Geological facts

Celestite gets its name from the Latin word 'caelestis', meaning celestial, in reference to its delicate sky-blue color. Madagascar is famous for producing some of the largest and most vibrant blue celestite crystal clusters in the world.

Field identification & locations

Easily identified by its soft blue color, tabular or pyramidal orthorhombic crystal habits, and perfect cleavage. Found worldwide, with major deposits in Madagascar, Italy, the USA, and Mexico.