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The Collaborative International Dictionary
KAl3Si3O10OH2

Muscovite \Mus"co*vite\, n. [See Muscovy glass.]

  1. A native or inhabitant of Muscovy or ancient Russia; hence, a Russian.

  2. An inhabitant of Moscow.

  3. (Min.) Common potash mica, essentially KAl3Si3O10(OH)2. It is used as an electrical insulator. See Mica.