metamorphic

Chlorite-rich metamorphic rock, likely greenschist

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

AI-generated identification · may be incorrect

Identified September 11, 2026More metamorphic →

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Physical properties

Typically green to dark gray, with a sparkly micaceous or granular texture and weak foliation; hardness about 2–6 depending on mineral mix, generally dull to pearly luster, and specific gravity around 2.8–3.3. The image suggests abundant chlorite and possibly epidote or actinolite, but exact identification requires testing.

Formation & geological history

Forms by low- to medium-grade metamorphism of basalt or other mafic volcanic rocks, commonly during regional metamorphism in subduction-zone belts. Most examples are Paleozoic to younger, though greenschist facies rocks occur in ancient terrains worldwide.

Uses & applications

Used locally as decorative stone, aggregate, landscaping material, and occasionally dimension stone; attractive specimens are collected rather than used as gemstones.

Geological facts

Its green color commonly comes from chlorite, epidote, and amphibole produced as mafic rocks metamorphose. It may preserve relict volcanic textures or pillow structures.

Field identification & locations

Look for green foliation, flaky chlorite, and harder granular epidote or quartz; a streak, hardness, and thin-section examination would help distinguish greenschist from chlorite schist or altered basalt. Common in metamorphic belts worldwide, including the Appalachians, Alps, Japan, and western North America.