metamorphic

Weathered metamorphic rock, likely chlorite schist or greenstone

Chlorite-rich schist/greenschist; exact identification requires testing

AI-generated identification · may be incorrect

Gray-green, fine- to medium-grained, dull to weakly satiny luster, with pale veining and possible foliation. Estimated hardness 3–6 Mohs; cleavage or fracture is irregular, and the specimen appears naturally weathered or roughly cut.

Identified September 3, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed when basaltic or sedimentary rock underwent low- to medium-grade metamorphism, producing chlorite, actinolite, epidote, albite, and quartz. Such rocks commonly formed in ancient volcanic belts and metamorphic terranes, often hundreds of millions to billions of years old.

Uses & applications

Used locally as decorative stone, landscaping material, or informal cutting and polishing rough; attractive schist may be collected but is generally not gem-grade.

Geological facts

The green coloration commonly reflects chlorite, epidote, or amphibole rather than copper minerals. The image alone cannot reliably distinguish chlorite schist from altered basalt, greenstone, or serpentinized rock.

Field identification & locations

Look for planar foliation, sparkly mica-like surfaces, and a green-gray streak; a streak test, hardness test, magnetism check, and acid test would improve identification. Common in metamorphic mountain belts worldwide, including the Appalachians, Alps, and Precambrian shields.