metamorphic
Likely mica-rich schist
Mica schist, composed mainly of quartz and mica (muscovite and/or biotite)
AI-generated identification · may be incorrectUneven gray-brown specimen with reflective, platy flakes and schistose layering. Mica has Mohs hardness about 2–3 and pearly to vitreous luster; quartz is 7. The image does not show enough detail to confirm the minerals or identify the mica species.
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Physical properties
Uneven gray-brown specimen with reflective, platy flakes and schistose layering. Mica has Mohs hardness about 2–3 and pearly to vitreous luster; quartz is 7. The image does not show enough detail to confirm the minerals or identify the mica species.
Formation & geological history
Forms when clay-rich sedimentary rocks are metamorphosed under heat and pressure, aligning mica into layers; age depends on the locality and cannot be determined from the image.
Uses & applications
Mica-rich schist is mainly a collector or decorative stone; some varieties are used as dimension stone or landscaping material.
Geological facts
Its sparkly sheen comes from mica flakes reflecting light along the rock’s foliation.
Field identification & locations
Look for visible platy flakes and a tendency to split along wavy, mica-rich layers; distinguish it from slate by its coarser, glittering minerals. Found in metamorphic mountain belts worldwide.
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