noun Mineralogy.
  1. a white hydrous chloride of potassium and magnesium, KMgCl3⋅6H2O, used chiefly as a source of potassium and magnesium.

Origin of carnallite

1875–85; named after R. von Carnall (1804–74), German mining official; see -ite1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of carnallite

British Dictionary definitions for carnallite


  1. 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.MgCl 2 .6H 2 O

Word Origin for carnallite

C19: named after Rudolf von Carnall (1804–74), German mining engineer; see -ite 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012