metamorphic

Green schist (likely chlorite schist)

Chlorite schist; commonly dominated by chlorite, actinolite, epidote, quartz, and feldspar

AI-generated identification · may be incorrect

Dark green-gray, foliated and irregularly layered, with a dull to slightly silky luster. Typical hardness is about 2–4 for chlorite-rich material; individual crystals may show platy cleavage, and specific gravity is roughly 2.7–3.3.

Identified September 20, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when basaltic or clay-rich rocks undergo low- to medium-grade regional metamorphism, commonly during mountain building. Its exact geological age cannot be determined from the photograph.

Uses & applications

Used locally as decorative stone, aggregate, or occasionally carving material; attractive pieces are collected, though it is generally not a major gemstone or construction stone.

Geological facts

The green color commonly comes from chlorite, epidote, actinolite, or serpentine. Strong planar foliation and the ability to split along mineral layers distinguish schist from massive greenstone.

Field identification & locations

Look for visible aligned flakes or bands, green coloration, and splitting surfaces; a hand lens may reveal shiny chlorite plates. Common in metamorphic belts worldwide, including the Alps, Appalachians, and Pacific coastal ranges.