Mineral (Found in Igneous and Metamorphic rocks)

Mica (specimen appears to be Muscovite or Phlogopite)

Phyllosilicate mineral; Muscovite: KAl2(AlSi3O10)(F,OH)2

AI-generated identification · may be incorrect

Hardness: 2-2.5 (Mohs scale); Color: Silvery-white to brownish-gold; Luster: Pearly to Vitreous; Structure: Monoclinic; Cleavage: Perfect basal (peels into thin sheets); Specific Gravity: 2.76-3.0

Hardness: 2-2
Color: Silvery-white to brownish-gold
Luster: Pearly to Vitreous

Identified March 27, 2026More mineral (found in igneous and metamorphic rocks) →

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Physical properties

Hardness: 2-2.5 (Mohs scale); Color: Silvery-white to brownish-gold; Luster: Pearly to Vitreous; Structure: Monoclinic; Cleavage: Perfect basal (peels into thin sheets); Specific Gravity: 2.76-3.0

Formation & geological history

Formed through the regional metamorphism of argillaceous rocks or as a primary mineral in felsic igneous rocks (granites/pegmatites). It can be found in rocks from the Precambrian to Cenozoic eras.

Uses & applications

Used primarily as an electrical insulator in electronics, as a filler in paints and plastics, and in cosmetics (glitter effect). Historically used for furnace windows ('Isinglass').

Geological facts

Mica is one of the few minerals that can be split into sheets thin enough to be transparent while remaining heat resistant. It was once used as window panes for homes in Russia before glass became common.

Field identification & locations

Identify by its 'peeling' nature; specimens split easily into thin, flexible, elastic flakes. Commonly found in pegmatite veins or schist. High-quality specimens are often found in Brazil, India, and the USA (Appalachians).