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Celestine

Celestine is generally found as colourless, milky white, yellow, orange or pale blue prismatic crystals or perhaps in fine-grained masses. Having a hardness of only 3.5 on Moh’s scale and perfect cleavage, Celestine is very fragile. It's been cut for that collector, however, plus some fine specimens are visible in museums.
Celestine may occur with sandstones or limestones, in evaporate deposits, in pegmatites, in cavities in volcanic rocks, or with galena and sphalerite in mineral veins. The majority of the material that's able to be faceted can be found in either Namibia or Madagascar. It's also present in Italy (including Sicily), England, Czechoslovakia, the united states, and Canada.



Properties
Chemical Composition: Strontium sulphate
Crystal System / Forms: Orthorhombic
Hardness: 3.5
Specific Gravity: 3.98
Lustre: Vitreous to pearly.
Refractive Index / Birefringence: 1.62-1.63 / 0.010
Cuts & Uses: Brilliant, Mixed.
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