carnallite

[kahr-nl-ahyt]
noun Mineralogy.
a white hydrous chloride of potassium and magnesium, KMgCl 3 ⋅6H 2 O, used chiefly as a source of potassium and magnesium.

Origin:
1875–85; named after R. von Carnall (1804–74), German mining official; see -ite1

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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]

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Encyclopedia Britannica
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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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Example sentences
Carnallite ore is the raw material from which magnesium is obtained electrolytically.
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