mineral
Muscovite Mica
KAl2(AlSi3O10)(OH)2
Hardness: 2-2.5; Color: Colorless, silvery-white, or tan; Luster: Vitreous to pearly; Crystal Structure: Monoclinic; Cleavage: Perfect basal (peels into thin sheets).
- Hardness
- 2-2
- Color
- Colorless, silvery-white, or tan
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 2-2.5; Color: Colorless, silvery-white, or tan; Luster: Vitreous to pearly; Crystal Structure: Monoclinic; Cleavage: Perfect basal (peels into thin sheets).
Formation & geological history
Forms in igneous rocks like pegmatites and granites, as well as metamorphic rocks like schists and gneisses through the alteration of minerals under heat and pressure.
Uses & applications
Used as an electrical and thermal insulator in electronics, as a glitter effect in cosmetics/paints, and in drilling muds.
Geological facts
Commonly known as 'Isinglass', it was once used for oven windows because it is transparent and heat-resistant. Sheets can be peeled so thin they become flexible.
Field identification & locations
Identify by its unique 'book' structure and perfect cleavage that allows you to flake off transparent, plastic-like sheets with a fingernail.
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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
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock