mineral
Mica (Muscovite or Biotite)
Sheet silicate mineral group (e.g., KAl2(AlSi3O10)(F,OH)2)
Hardness: 2-2.5 on Mohs scale. Color: silvery-white, gray, brown, or black. Luster: pearly to vitreous. Crystal structure: monoclinic, highly characteristic sheet-like or flaky cleavage that peels into thin, elastic sheets.
- Hardness
- 2-2
- Color
- silvery-white, gray, brown, or black
- Luster
- pearly to vitreous
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Physical properties
Hardness: 2-2.5 on Mohs scale. Color: silvery-white, gray, brown, or black. Luster: pearly to vitreous. Crystal structure: monoclinic, highly characteristic sheet-like or flaky cleavage that peels into thin, elastic sheets.
Formation & geological history
Formed in igneous, metamorphic, and sedimentary environments, particularly in pegmatites, granites, and schists under high pressure and temperature conditions.
Uses & applications
Used in electronics as an insulator, in cosmetics for a shimmering effect, in paints, and in construction materials.
Geological facts
Mica minerals are well known for their perfect basal cleavage, allowing them to split into extremely thin, flexible, and often transparent sheets.
Field identification & locations
Easily identified by its shiny, flaky appearance and ability to be peeled into thin sheets using a fingernail or knife.
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