mineral
Muscovite
KAl2(AlSi3O10)(OH)2
AI-generated identification · may be incorrectHardness of 2-2.5 on Mohs scale, silvery-white to yellowish color, pearly to vitreous luster, monoclinic crystal system, perfect basal cleavage.
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Physical properties
Hardness of 2-2.5 on Mohs scale, silvery-white to yellowish color, pearly to vitreous luster, monoclinic crystal system, perfect basal cleavage.
Formation & geological history
Forms in igneous rocks like pegmatites, as well as metamorphic rocks such as schists and gneisses, through crystallization from cooling magma or regional metamorphism.
Uses & applications
Used in electrical insulation, paints, plastics, cosmetics for pearlescent shimmer, and as a refractory material.
Geological facts
Muscovite is the most common mineral of the mica family and was historically used as a substitute for glass in stove windows.
Field identification & locations
Easily identified by its distinct sheet-like cleavage that peels into flexible, elastic transparent layers. Commonly found worldwide in pegmatite veins.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Limonite
FeO(OH)•nH2O
mineral
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Feldspar
Feldspar Group (Tectosilicate, e.g., KAlSi3O8)
mineral
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous