carnallite

[kahr-nl-ahyt]

car·nall·ite

[kahr-nl-ahyt]
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 -ite1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Carnallite is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Collins
World English Dictionary
carnallite (ˈkɑːnəˌlaɪt)
 
n
a white or sometimes coloured mineral consisting of a hydrated chloride of potassium and magnesium in orthorhombic crystalline form: a source of potassium and also used as a fertilizer. Formula: KCl.MgCl2.6H2O
 
[C19: named after Rudolf von Carnall (1804--74), German mining engineer; see -ite1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
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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