Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
monocliniccommonSilicates
Muscovite
KAl₂(AlSi₃O₁₀)(OH)₂
This image displays a superb specimen of intergrown, platy muscovite crystals, exhibiting a silvery-white to light brown color and a characteristic pearly luster.
Muscovite Physical Properties
Mohs Hardness
2Crystal System
monoclinicLuster
vitreousStreak Color
whiteCleavage
perfect basal (one direction)Fracture
unevenSpecific Gravity
2.8Colors
colorless, white, silver, pale yellow, pale brown, pale greenTransparency
transparent/translucentType Locality
Minas Gerais, Southeast Region, BrazilMineral Group
SilicatesUses
electrical insulator, heat insulator, filler, cosmetics, jewelry (rarely), collectorAssociated Minerals
quartz, feldspar, tourmaline, beryl, garnetRarity
commonGeological Context
Muscovite is a common rock-forming mineral found in igneous rocks (especially granites and pegmatites) and metamorphic rocks (schists, gneisses). It forms under a wide range of pressure and temperature conditions during regional metamorphism.
