metamorphic
White mica schist
Muscovite–quartz schist; predominantly muscovite mica (KAl₂(AlSi₃O₁₀)(OH)₂) and quartz (SiO₂)
AI-generated identification · may be incorrectTypically silvery white to pale gray, with a glittery pearly luster and strongly foliated, flaky texture; muscovite hardness 2–2.5 and quartz 7, with mica cleavage producing flexible sheets. The image suggests a coarse, mica-rich metamorphic rock, though exact identification requires a fresh surface and testing.
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Physical properties
Typically silvery white to pale gray, with a glittery pearly luster and strongly foliated, flaky texture; muscovite hardness 2–2.5 and quartz 7, with mica cleavage producing flexible sheets. The image suggests a coarse, mica-rich metamorphic rock, though exact identification requires a fresh surface and testing.
Formation & geological history
Formed when clay-rich sedimentary rock was subjected to regional metamorphism, commonly during mountain building; age varies widely from Precambrian to younger orogenic belts.
Uses & applications
Used locally as decorative stone, fill, and occasionally dimension stone; attractive specimens are collected, but it is not generally a jewelry material.
Geological facts
Mica schist can split along foliation and sparkle strongly in sunlight. Abundant mica may make the rock friable and unsuitable for high-traffic construction.
Field identification & locations
Identify by visible aligned, peelable mica flakes, foliation, and a non-acid-reactive surface; common in metamorphic mountain belts worldwide, including the Appalachians, Alps, and Himalaya.
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