mineral
Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide), KAl2(AlSi3O10)(OH)2
Hardness: 2-2.5; Color: Colorless, silvery-white, or brownish; Luster: Pearly to vitrous; Crystal: Monoclinic; Cleavage: Perfect basal (peels in thin, flexible sheets)
- Hardness
- 2-2
- Color
- Colorless, silvery-white, or brownish
- Luster
- Pearly to vitrous
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Physical properties
Hardness: 2-2.5; Color: Colorless, silvery-white, or brownish; Luster: Pearly to vitrous; Crystal: Monoclinic; Cleavage: Perfect basal (peels in thin, flexible sheets)
Formation & geological history
Formed in igneous environments (pegmatites and granites) and metamorphic rocks (schists and gneisses) through cooling magma or regional metamorphism. Common throughout most geological eras.
Uses & applications
Used as an electrical insulator, in paints, cosmetics (for shimmer), joint compounds, and as 'isinglass' for furnace windows.
Geological facts
Known as 'Muscovy-glass' because it was once used in Russia as a window material. It is heat resistant and transparent in thin sheets.
Field identification & locations
Identified by its distinctive ability to peel into thin, elastic, transparent layers. Often found as small shiny flakes in sand or granite outcrops.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic