metamorphic
Mica-rich schist
Quartz–muscovite/biotite schist
AI-generated identification · may be incorrectTypically composed of quartz, mica, and feldspar; Mohs hardness about 2–7 depending on grain, with silvery or dark glitter, foliated texture, and mica’s perfect basal cleavage. The specimen appears gray, sparkly, and strongly micaceous, though exact identification from one image is limited.
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Physical properties
Typically composed of quartz, mica, and feldspar; Mohs hardness about 2–7 depending on grain, with silvery or dark glitter, foliated texture, and mica’s perfect basal cleavage. The specimen appears gray, sparkly, and strongly micaceous, though exact identification from one image is limited.
Formation & geological history
Formed when shale or other clay-rich sediment was subjected to regional metamorphism, causing mica growth and alignment; commonly Paleozoic to Precambrian, though age depends on locality.
Uses & applications
Used locally as crushed stone, aggregate, decorative landscaping rock, and occasionally dimension stone; attractive pieces are collected but are rarely valuable as gemstones.
Geological facts
Its glitter comes from reflective mica flakes rather than metallic minerals. Foliation allows it to split along aligned mica layers, and weathering commonly produces rusty iron staining.
Field identification & locations
Identify it by visible aligned flakes, planar foliation, sparkly surfaces, and easy splitting; distinguish it from granite by its layered fabric. Common in metamorphic mountain belts worldwide, including New England, the Appalachians, Scotland, and the Alps.
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