Mica meaning

mī'kə
Any of a group of chemically and physically related aluminum silicate minerals, common in igneous and metamorphic rocks, characteristically splitting into flexible sheets used in insulation and electrical equipment.
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Any of a group of minerals that are complex silicates that crystallize in thin, somewhat flexible, translucent or colored, easily separated layers, including muscovite, biotite, and lepidolite: mica is resistant to heat and electricity.
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Any of a group of hydrous aluminosilicate minerals with the general formula (K,Na,Ca)(Mg,Fe,Li,Al)2–3 (Al,Si)4 O10 (OH,F)2 that can be split easily into thin, partly transparent sheets. Mica is common in igneous and metamorphic rocks and often occurs as flakes or sheets. It is highly resistant to heat and is used in electric fuses and other electrical equipment. Muscovite and biotite are types of mica.
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Any of a group of hydrous aluminosilicate minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic.
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Origin of mica

  • Latin mīca grain (perhaps influenced by micāre to flash)
    From American Heritage Dictionary of the English Language, 5th Edition
  • From Latin mÄ«ca (“grain, crumb").
    From Wiktionary