metamorphic

Graphite-rich metamorphic rock (likely graphite schist)

Graphite schist; predominantly graphitic carbon (C) with mica and quartz

AI-generated identification · may be incorrect

Dark gray to black, strongly reflective metallic-to-submetallic luster, platy/foliated texture, and probable greasy feel; graphite has Mohs hardness 1–2, while associated quartz and mica are harder. The specimen appears massive and flaky rather than crystalline, with no obvious cleavage faces visible.

Identified August 31, 2026More metamorphic →

Explore Graphite-rich metamorphic rock (likely graphite schist) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed when carbon-rich sedimentary material was metamorphosed under heat and pressure, commonly during regional mountain-building; its exact geological age cannot be determined from the image. Graphite formed by recrystallization of organic carbon in the protolith.

Uses & applications

Used industrially for lubricants, refractories, batteries, crucibles, electrodes, and pencils; graphite-rich schist is mainly a teaching or collector specimen and is rarely used as dimension stone.

Geological facts

A useful test is that graphite marks unglazed ceramic or paper and conducts electricity; unlike metallic ore, it is very soft and leaves a dark streak. Common localities include Sri Lanka, Madagascar, China, Brazil, Canada, and the United States.

Field identification & locations

Identify it by black silvery flakes, foliation, very low hardness, and a dark streak; avoid confusing it with hard, glassy metallic sulfides or slag. A definitive identification requires streak, conductivity, hardness, and mineralogical testing.