mineral
Muscovite mica
Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂
AI-generated identification · may be incorrectPale tan to silvery, pearly-glassy luster, with broad sheets and perfect basal cleavage; hardness 2–2.5 Mohs. The image appears to show a large, sheet-like mica specimen, though identification from appearance alone is not definitive.
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Physical properties
Pale tan to silvery, pearly-glassy luster, with broad sheets and perfect basal cleavage; hardness 2–2.5 Mohs. The image appears to show a large, sheet-like mica specimen, though identification from appearance alone is not definitive.
Formation & geological history
Forms in granitic pegmatites and mica-rich metamorphic rocks through crystallization or metamorphism; commonly Precambrian, but occurs across many geological ages.
Uses & applications
Used in electrical and thermal insulation, ground into fillers and cosmetics, and collected as mineral specimens.
Geological facts
Muscovite splits into thin, flexible, transparent sheets, a property historically used for window panes and stove doors.
Field identification & locations
Look for a book-like stack of sheets that peel along one flat plane and have a pearly sheen; common in pegmatites worldwide, including India, Brazil, Russia, and the United States.
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Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous