mineral
Muscovite Mica (Golden/Yellow variety)
KAl2(AlSi3O10)(F,OH)2
AI-generated identification · may be incorrectHardness: 2-2.5 (Mohs scale), Color: Pale yellow to golden-brown, Luster: Vitreous to pearly, Crystal structure: Monoclinic, Cleavage: Perfect basal (peels into thin flexible sheets), Specific gravity: 2.76-3.0
- Hardness
- 2-2
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Physical properties
Hardness: 2-2.5 (Mohs scale), Color: Pale yellow to golden-brown, Luster: Vitreous to pearly, Crystal structure: Monoclinic, Cleavage: Perfect basal (peels into thin flexible sheets), Specific gravity: 2.76-3.0
Formation & geological history
Forms primarily in metamorphic rocks like schist and phyllite, and igneous rocks like granite pegmatites via cooling of molten rock or hydrothermal activity. Often found in continental crust environments.
Uses & applications
Used as an electrical insulator in electronics, as a glitter agent in cosmetics and paints, and as a component in joint compound and heat-resistant windows (isinglass).
Geological facts
In medieval Russia, it was known as Muscovy-glass because it was used as a cheap alternative to glass in windows. It is highly resistant to heat and electricity.
Field identification & locations
Identify by its ability to peel into paper-thin, transparent sheets with a fingernail. It should feel smooth and slightly flexible. Commonly found in micaceous schists or as large sheets in pegmatite deposits.
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Other mineral specimens
Gneiss or Schist
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