metamorphic

Coarse-grained metamorphic rock, likely mica schist

Mica schist, probably muscovite–biotite schist with quartz and feldspar

AI-generated identification · may be incorrect

Gray-brown, moderately foliated, with visible reflective mica flakes and granular quartz/feldspar; mica gives a pearly to vitreous luster. Hardness is roughly 2–7 depending on the tested mineral, with mica cleavage and generally weak-to-moderate specific gravity around 2.7.

Identified September 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or another clay-rich sediment was subjected to elevated pressure and temperature during regional metamorphism, commonly in mountain belts. Its exact geological age cannot be determined from the photograph.

Uses & applications

Used locally as decorative stone, landscaping material, or aggregate; attractive pieces may be collected, but it is generally unsuitable for high-end jewelry or durable building facades because foliation promotes splitting.

Geological facts

The sparkly surfaces are likely mica aligned along foliation planes, a key schist characteristic. Individual minerals cannot be confirmed without a fresh surface, streak, hardness tests, or microscopy.

Field identification & locations

Look for planar layering, easily visible mica flakes, and splitting into thin irregular slabs; common sources include metamorphic mountain regions worldwide. The specimen may also be weathered gneiss or phyllite, so identification is approximate from the image.