metamorphic
Likely mica schist
Mica-rich schist, chiefly muscovite and/or biotite with quartz and feldspar
AI-generated identification · may be incorrectCoarse, glittery, foliated texture with pale silvery mica and darker gray-brown minerals. Mica has Mohs hardness 2–3 and perfect basal cleavage; quartz, if present, is hardness 7. The small, weathered specimen does not allow a certain identification.
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Physical properties
Coarse, glittery, foliated texture with pale silvery mica and darker gray-brown minerals. Mica has Mohs hardness 2–3 and perfect basal cleavage; quartz, if present, is hardness 7. The small, weathered specimen does not allow a certain identification.
Formation & geological history
Schist forms when clay-rich sedimentary or volcanic rocks are recrystallized under heat and pressure, aligning mica into foliation. Such rocks occur in many ancient metamorphic terranes; the age of this specimen cannot be determined from the image.
Uses & applications
Schist is used locally as decorative stone, landscaping material, and sometimes building stone; mica-bearing specimens are also collected. It is generally unsuitable for high-strength construction where its foliation splits easily.
Geological facts
The visible sparkle and platy, flaky surface are characteristic of mica-rich rocks. Schist is named for its pronounced tendency to split along aligned mineral grains.
Field identification & locations
Look for glittering mica flakes and a layered or wavy foliation; distinguish it from massive granite by its aligned grains. Found in regional metamorphic belts worldwide, but a fresh surface or locality would improve identification.
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