metamorphic

Likely mica schist

Mica-rich schist, probably muscovite/biotite schist with quartz and feldspar

AI-generated identification · may be incorrect

Coarse, foliated texture with reflective silvery mica and rusty-brown weathering. Mica is Mohs 2–3; quartz is Mohs 7. The image alone cannot establish exact mineral proportions or cleavage.

Identified October 13, 2026More metamorphic →

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Physical properties

Coarse, foliated texture with reflective silvery mica and rusty-brown weathering. Mica is Mohs 2–3; quartz is Mohs 7. The image alone cannot establish exact mineral proportions or cleavage.

Formation & geological history

Formed when clay-rich sedimentary rock was buried and metamorphosed under heat and pressure, aligning mica into foliation. The age depends on the source region and cannot be determined from the photograph.

Uses & applications

Commonly collected as a specimen; some schists are used as decorative stone or aggregate, though strong foliation can limit construction use.

Geological facts

Schistosity is the visible alignment of platy minerals, which can make the rock split along wavy surfaces.

Field identification & locations

Look for glittering mica flakes and a foliated, layered structure; rusty tones may reflect iron-oxide weathering. Schists occur in metamorphic mountain belts worldwide.