Amphibole

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Hornblende

Description

One of the major classes of silicate minerals. Amphiboles, in general, are a series of doubly hydrated silicates containing either sodium, calcium, magnesium, iron, or aluminum. They are distinguished from pyroxenes, a second major class, by their cleavage planes. Amphiboles have cleavage angles of 56 and 124 degrees while pyroxenes have cleavage angles of 5 and 93 degrees. Amphiboles are commonly found in both igneous and metamorphic rocks. Examples of some amphibole minerals are: hornblende, glaucophane, amphibolite, actinolite, and tremolite.

Synonyms and Related Terms

amfibol (Ces., Sven.); Amphibol (Deut.); amphibole (Fr.); amfibool (Ned.); amfibole (Pol.); anfĂ­bola (Port.); (Sven.)

Density 2.9-3.2

Sources Checked for Data in Record

  • R.F.Symmes, T.T.Harding, Paul Taylor, Rocks, Fossils and Gems, DK Publishing, Inc., New York City, 1997
  • CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: density=2.9-3.2
  • 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

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