metamorphic
Mica-rich schist (likely biotite schist)
Mica schist, composed mainly of quartz and mica (biotite and/or muscovite)
AI-generated identification · may be incorrectCoarse, foliated texture with glittering golden-brown flakes, likely mica; mica is Mohs 2–3 and quartz 7. The photo does not allow reliable confirmation of mineral proportions or specific gravity.
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Physical properties
Coarse, foliated texture with glittering golden-brown flakes, likely mica; mica is Mohs 2–3 and quartz 7. The photo does not allow reliable confirmation of mineral proportions or specific gravity.
Formation & geological history
Forms when clay-rich sedimentary or igneous rocks undergo regional metamorphism, causing mica to grow and align; age depends on the local bedrock and cannot be determined from the image.
Uses & applications
Mostly a collector specimen; mica-bearing schist has limited decorative or landscaping use, while separated mica has industrial applications.
Geological facts
Its sparkly sheen and layered appearance result from aligned platy mica crystals; the golden color may reflect biotite, weathering, or lighting.
Field identification & locations
Look for visible flakes and a tendency to split along wavy, mica-rich foliation; common in metamorphic mountain belts worldwide. A close examination or simple scratch and cleavage tests would help confirm the identification.
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