metamorphic

Graphite-bearing schist

Graphitic schist, composed mainly of quartz, mica, and graphite

AI-generated identification · may be incorrect

Dark gray to black with silvery sheen and distinct foliation; mica-rich layers split along planes. Graphite is very soft (Mohs 1–2), while quartz is Mohs 7; the specimen’s overall hardness varies with composition.

Identified October 8, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when carbon-rich sedimentary rocks underwent regional metamorphism, aligning mica and concentrating graphite. Its age cannot be determined from the image and depends on its source locality.

Uses & applications

Graphitic schist is mainly a collector specimen or source of geological study; graphite-rich material may have limited industrial use, while schist is sometimes used as decorative stone.

Geological facts

The layered, flaky appearance is characteristic of schistosity; the dark material may include graphite, though visual identification alone cannot confirm its composition.

Field identification & locations

Look for sparkly platy mica, strong foliation, and dark graphite-rich bands; test a graphite-rich surface for a soft gray mark. Graphitic schist occurs in metamorphic belts worldwide.