metamorphic

Foliated metamorphic rock, likely schist

Mica schist or chlorite schist; composition commonly quartz + mica/chlorite ± feldspar

AI-generated identification · may be incorrect

Typically gray-green to dark green with wavy foliation, flaky texture, and locally sparkly mica; hardness about 2–7 depending on minerals, with mica cleavage and uneven to schistose fracture. The specimen appears weathered and unpolished.

Identified September 10, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or other clay-rich sedimentary rock underwent moderate regional metamorphism, realigning platy minerals into foliation. Its exact age and locality cannot be determined from the image.

Uses & applications

Used locally as decorative stone, landscaping material, and occasionally wall or roofing stone; attractive micaceous varieties are collected but are generally not jewelry gemstones.

Geological facts

The aligned layers reflect directed pressure during mountain building. Green coloration commonly indicates chlorite, epidote, or other low- to medium-grade metamorphic minerals.

Field identification & locations

Identify it by visible planar banding or foliation, glittering flakes, and the tendency to split along layers; distinguish it from slate by its coarser grains and stronger sparkle. Common in regional metamorphic belts worldwide.