metamorphic

Graphite-bearing schist (probable)

Graphite schist; chiefly quartz, mica, and graphite

AI-generated identification · may be incorrect

Fine- to medium-grained, strongly foliated specimen with shiny dark graphite/mica layers and pale quartz-rich bands. Mohs hardness is roughly 1–3 for graphite-rich surfaces and 6–7 for quartz; luster ranges from metallic to pearly, with flaky cleavage parallel to foliation.

Identified September 9, 2026More metamorphic →

Explore Graphite-bearing schist (probable) 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 carbonaceous sedimentary rock was subjected to regional metamorphism, producing aligned mica and graphite; commonly Paleozoic or older, though age depends on locality. The image alone cannot determine its precise age or provenance.

Uses & applications

Primarily a collector specimen; graphite-rich material may be used for lubricants, refractories, batteries, and pencils, while schist can occasionally serve as decorative stone or aggregate.

Geological facts

Graphite is a carbon mineral and marks high-grade alteration of organic matter. Its flakes may leave a gray-black streak and feel greasy, unlike most dark silicate rocks.

Field identification & locations

Look for pronounced foliation, glittering platy minerals, softness, and a dark streak; a streak test and hardness test help distinguish it from biotite schist or slate. Graphite schists occur in metamorphic belts worldwide, including Canada, the United States, Sri Lanka, and Madagascar.