Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. 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.

from the GNU version of the Collaborative International Dictionary of English

  • n. The name of a group of minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic. They differ widely in composition, and vary in color from pale brown or yellow to green or black. The transparent forms are used in lanterns, the doors of stoves, etc., being popularly called isinglass. Formerly called also cat-silver, and glimmer.

from The Century Dictionary and Cyclopedia

  • n. A crumb; a little bit.
  • n. One of a group of minerals all of which are characterized by their very perfect bassal cleavage, in consequence of which they can be separated easily into extremely thin, tough, and usually elastic laminæ.
  • n. In the preparation of kaolin for use in the manufacture of porcelain, one of the second set of channels through which a mixture of water and suspended clay washed out by the water from the broken clay-bearing rock is slowly passed to obtain the deposition of flakes of mica and other foreign substances, and thus to purify the clay, which is finally allowed to subside in a series of pits or tanks.
  • n. A prefix frequently used in lithology when the rock in question contains more or less mica in addition to the other usual constituents. Thus, mica-syenite, a rock differing very little from ordinary syenite; mica-trap, nearly the same as minette, etc.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity

Etymologies

Latin mīca, grain (perhaps influenced by micāre, to flash).
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin mīca ("grain, crumb"). (Wiktionary)

Examples

  • Micas provide shimmer because a mica is a flat platelet that reflects and refracts light, similar to a diamond in the sun.

    Anti-Talc - Day Four - Gold Mica & Mess

  • A question for Anne-Marie: The Bramble Berry website says that the shamrock mica is a bleeding color -- will this be an issue with the layered soap?

    Amy's First Soap

  • Dragonlady~ The heavy metal gold mica is a brand new product that we are actually testing right now (we love it too)!

    Loopy Soap Reveal!

  • The heavy gold mica is the perfect foil for the bright and cheery colors of yellow and purple, giving the look a little edge.

    Geometric Soap Reveal

  • The name mica was probably created from the Latin word micare meaning to shine in reference to the shiny luster of the micas.

    Mica

  • Those interested in the electrical industry will know that mica is playing a large part as an insulator.

    The Mineral Resources of Ontario

  • Shimmer is made of light-reflecting crystals called mica.

    Best in Beauty

  • Vermiculite is a mineral that belongs to a group of minerals called the mica minerals.

    Vermiculite

  • It is made of a combination of solid lubricant and ground or pulverized mica, that is where it gets its name, and nothing can equal mica as a lubricant if you could apply it to your gear; and to do this it has been combined with a heavy grease.

    Rough and Tumble Engineering

  • Under the microscope, the rock consists of biotite, hornblende, serpentinous pseudo-morphs after olivine and possibly after enstatite and magnetite, and may be described as a mica-hornblende-picrite.

    Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"

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