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A colorless or yellow transparent crystal occasionally used as a Gemstone. Danburite is composed of calcium borosilicate. It was named for its first reported occurence in Danbury, Connecticut. Colorless danburite is mined in Japan and Mexico (San Luis Potosi) and yellow danburite is mined in Madagascar and Myanmar.



Synonyms and Related Terms

calcium borosilicate

Physical and Chemical Properties

  • Orthorhombic system with prismatic crystals.
  • Poor cleavage in one direction.
  • Fracture = uneven to conchoidal.
  • Luster = vitreous.
  • Streak = colorless.
Composition CaB2Si2O8
Mohs Hardness 7.0
Density 3.0 g/ml

Resources and Citations

  • R.F.Symmes, T.T.Harding, Paul Taylor, Rocks, Fossils and Gems, DK Publishing, Inc., New York City, 1997
  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979

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