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A hydrated aluminum oxide mineral. Diaspore occurs naturally with Bauxite, Corundum, and Emery. It is a white or pale colored mineral ranging from transparent to translucent. Diaspore has been found in Hungary, Greece, Asia Minor, the Ural Mountains and the United States (Massachusetts). It is used as an Abrasive and a refractory clay.

Synonyms and Related Terms

aluminum hydroxide; diásporo (Esp.); Diaspor (Deut.); diaspoor (Ned.)



Physical and Chemical Properties

  • Prismatic orthorhombic crystals.
  • Brittle with conchoidal fracture.
  • Luster = vitreous to pearly
Composition AlO(OH)
Mohs Hardness 6.5 - 7.0
Density 3.3-3.5 g/ml

Resources and Citations

  • Robert Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Company, Radnor, PA, 1992
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998