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Definition of mica : 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.

Synonyms:

haematite, felspar, hematite, igneous, chalk, flint, basalt, isinglass

clay, calcite, lignite, manganese, talcum, chromite, bauxite, corundum, azurite, hornblende, kaolinite, peat, asbestos, alabaster, fluorspar, fluorite, coke, silicate, silica, emery, obsidian, garnet, fool's gold, barite, selenite, graphite, feldspar, quicklime, iolite, aragonite, carbon, spar, mineral, lazurite, pitchblende, pyroxene, pyrite, pumice, gypsum, molybdenite, brookite, lime, orthoclase, cryolite, chlorite, salt, coal, diatomite, boron, brimstone, quartz, cobalt, ozocerite, glauconite, vermiculite, sulfur, chalcedony, crystal, rhodonite, magnesite

Usage examples:

• In addition to these, there were found a great number of shell beads, ornaments of mica, and bracelets of copper. - "See America First", Orville O. Hiestand.
• It is thus, thought we, that our manufacturers of fancy wax deal by their mica. - "Leading Articles on Various Subjects", Hugh Miller.
• We landed at twelve- thirty and cooked our lunch on the stove of a perfect beauty of a trapper's cabin near the mouth of Mica Creek. - "Down the Columbia", Lewis R. Freeman.