Celestine

Celestine is formed by precipitation directly from seawater or during the solidification of marine sediments, when spherical concretions of celestine are formed in the rock, sometimes with a cavity and well-defined crystals inside. Celestine, strontium sulfate, is close to and similar to barite, but in nature it is somewhat less widespread than barite. It can be colorless, white, light blue, yellowish, rarely red or brown. It forms earthy, solid, stellate, columnar to fibrous aggregates, concretions, and also columnar and tabular well-defined crystals sought after by collectors, transparent and translucent, perfectly and well-cleavable in two directions, with a glassy luster to dullness on crystal surfaces.

Celestine – a mineral with a sky-blue color
Celestine (also celestine) is a strontium sulfate with the chemical formula SrSO₄. It is most often found in the form of crystals and druses with a typical light blue to grayish color, which gave it its name derived from the Latin caelestis – heavenly.

Appearance and properties of celestine
Celestine crystallizes in the clinker system. It has a hardness of 3–3.5 on the Mohs scale and a vitreous luster. It often forms cavities in limestones and geodes, which contain clusters of translucent to clear crystals.

Celestine deposits
Significant deposits of celestine are found in Madagascar, Mexico, the USA and Poland. Beautiful blue geodes from Madagascar are among the most sought-after.

History and uses of celestine
The mineral was described in the early 19th century. It is popular among collectors for its aesthetic color and crystalline forms, and is also used as a decorative stone.

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