metamorphic
Silver-colored mica schist
Muscovite–quartz schist, possibly with biotite
AI-generated identification · may be incorrectTypically Mohs hardness 2–3 for muscovite and 7 for quartz; silvery-gray, strongly foliated, with pearly to vitreous luster. Platy mica flakes produce obvious sparkle and cleavage, while quartz forms harder granular layers.
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Physical properties
Typically Mohs hardness 2–3 for muscovite and 7 for quartz; silvery-gray, strongly foliated, with pearly to vitreous luster. Platy mica flakes produce obvious sparkle and cleavage, while quartz forms harder granular layers.
Formation & geological history
Formed when mica- and quartz-rich sedimentary or igneous rock was subjected to regional metamorphism, commonly during mountain building. Exact age cannot be determined from the photograph; such rocks range from Precambrian to recent orogenic belts.
Uses & applications
Used locally as decorative stone, landscaping material, and occasionally dimension stone, but its friability limits construction use. Attractive specimens are collected for their metallic-looking mica foliation.
Geological facts
The silvery appearance is usually caused by muscovite mica, not native silver. Its foliation reflects alignment of minerals under directed pressure and temperature.
Field identification & locations
Identify it by thin, bendable or flaky reflective sheets, pronounced layering, and a mixed hard-soft surface; a steel point scratches mica but not quartz. Common in metamorphic mountain belts worldwide, including the Appalachians, Alps, Himalaya, and Precambrian shields.
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