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carnallite

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car⋅nall⋅ite

  [kahr-nl-ahyt]
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–noun Mineralogy.
a white hydrous chloride of potassium and magnesium, KMgCl3·6H2O, used chiefly as a source of potassium and magnesium.
Origin:
1875–85; named after R. von Carnall (1804–74), German mining official; see -ite 1
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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car·nall·ite   (kär'nə-līt')   
n.  A white, brownish, or reddish mineral, KMgCl3·6H2O, an ore of potassium, used to manufacture potash salts.

[After Rudolf von Carnall (1804-1874), German mining engineer.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia

carnallite

a soft, white halide mineral, hydrated potassium and magnesium chloride (KMgCl36H2O), that is a source of potassium for fertilizers. Carnallite occurs with other chloride minerals in the upper layers of marine salt deposits, where it appears to be an alteration product of pre-existing salts. The mineral is found principally in the northern German salt deposits; and also in Spain, Tunisia, and the southwestern United States. For detailed physical properties, see halide mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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