How is mica formed

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  • How is mica used

    • Industrial uses of mica...

    Mica

    Group of phyllosilicate minerals

    This article is about the mineral or gem.

    Mica used in electronics

  • Mica used in electronics
  • Mica color
  • Industrial uses of mica
  • Mica mineral
  • Uses of mica in cosmetics

    • For other uses, see Mica (disambiguation).

    Mica
    CategoryPhyllosilicates
    Formula
    (repeating unit)    		AB2–3(X, Si)4O10(O, F, OH)2
    IMA symbolMca[1]
    Colorpurple, rosy, silver, gray (lepidolite); dark green, brown, black (biotite); yellowish-brown, green-white (phlogopite); colorless, transparent (muscovite)
    CleavageAlmost perfect
    Fractureflaky
    Mohs scalehardness2.5–4 (lepidolite); 2.5–3 (biotite); 2.5–3 (phlogopite); 2–2.5 (muscovite)
    Lusterpearly, vitreous
    StreakWhite, colorless
    Specific gravity2.8–3.0
    Diagnostic featurescleavage
    References[2][3][4][5]

    Micas (MY-kəz) are a group of silicateminerals whose outstanding physical characteristic is that individual mica crystals can easily be split into fragile elastic plates.

    This characteristic is described as perfect basal cleavage. Mica is common in igneous and metamorphic rock and is occasionally found as small flakes

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