metamorphic

Greenstone (likely chlorite-rich schist)

Greenschist; commonly composed of chlorite, actinolite, epidote, and albite

AI-generated identification · may be incorrect

Fine- to medium-grained, green-gray, with a dull to slightly silky luster and foliated, fractured surfaces. Hardness and exact mineral composition cannot be reliably determined from the image; greenstone commonly has Mohs hardness around 5–6.

Identified October 12, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when basaltic volcanic rock underwent low-grade metamorphism, commonly during ancient seafloor alteration or mountain-building. Its age depends on its source and cannot be determined from the photograph.

Uses & applications

Used as dimension stone, landscaping material, and occasionally as a decorative or carving stone; attractive pieces may be collected.

Geological facts

The green color commonly comes from chlorite, actinolite, or epidote rather than a single defining mineral.

Field identification & locations

The specimen’s green-gray color and uneven, somewhat foliated texture suggest greenstone, but the image alone cannot confirm it. Greenstones occur in metamorphic belts worldwide; a fresh surface and mineral tests would improve identification.