metamorphic

Graphite-bearing schist (probable graphite ore)

Graphite (C) in graphitic schist; identification is visual and uncertain

AI-generated identification · may be incorrect

Dark gray to black, strongly micaceous/foliated, with bright metallic to submetallic flakes and uneven fracture; graphite is very soft (Mohs 1–2), opaque, and leaves a mark on paper, while associated mica/quartz may be harder.

Identified September 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when carbon-rich sedimentary rocks undergo regional metamorphism, commonly during mountain building; ages vary from Precambrian to younger Paleozoic–Mesozoic terranes.

Uses & applications

Graphite is used in refractories, lubricants, batteries, pencils, and electrodes; attractive polished pieces may be sold as mineral specimens, though this rough fragment has limited commercial value.

Geological facts

The silvery reflective areas may be graphite or mica; a streak test is useful because graphite produces a dark gray streak and feels greasy, whereas mica flakes are harder and more elastic.

Field identification & locations

Common in metamorphic belts and graphite deposits worldwide, including Sri Lanka, Madagascar, China, Canada, and the United States. Estimated value: about $2–$15 as an ordinary specimen, higher if confirmed, well-crystallized, or from a notable locality.