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Celestite (strontium sulfate)


A pale blue naturally occuring mineral composed of Strontium sulfate. Celestite is found in sedimentary stone usually in conjunction with Halite and dolomitic limestone. Specimens have been found in England (Bristol), Italy (Sicily), Mexico (Matehuala) and the U.S.(Ohio, California). Celestite is mined as a source of strontium. It is also used in the manufature of ceramics, glass, and fireworks.

Synonyms and Related Terms

celestine; strontium sulfate





Physical and Chemical Properties

  • Orthorhombic system with tabular
  • Perfect cleavage in one direction; good in two directions.
  • Fracture = uneven.
  • Luster = vitreous to pearly.
  • Streak = white
  • Mohs Hardness =crystals.
  • Sometimes fluorescent. 3.0 - 3.5
  • Density = 3.9-4.0 g/ml

Resources and Citations

  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983

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