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  1. a native or inhabitant of Moscow.
  2. a native or inhabitant of the Grand Duchy of Muscovy.
  3. Also called white mica. (lowercase) Mineralogy. common light-colored mica, essentially KAl3Si3O10(OH)2, used as an electrical insulator.
  4. Archaic. a Russian.
  1. of, relating to, or characteristic of Moscow, Muscovy, or the Muscovites.

Origin of Muscovite

First recorded in 1545–55; Muscov(y) + -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for muscovite


  1. a pale brown, or green, or colourless mineral of the mica group, found in plutonic rocks such as granite and in sedimentary rocks. It is used in the manufacture of lubricants, insulators, paints, and Christmas "snow". Composition: potassium aluminium silicate. Formula: KAl 2 (AlSi 3)O 10 (OH) 2 . Crystal structure: monoclinicSee also mica

Word Origin

C19: from the phrase Muscovy glass, an early name for mica


  1. a native or inhabitant of Moscow
  1. an archaic word for Russian
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

muscovite in Science


  1. A usually colorless to yellow or pale-gray mica. Muscovite is a monoclinic mineral and is found in igneous rocks, such as granites and pegmatites, metamorphic rocks, such as schists and gneisses, and in many sedimentary rocks. Chemical formula: KAl2(AlSi3)O10(OH)2.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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