metamorphic

Graphite-rich metamorphic rock (probable graphite schist)

Graphite schist; predominantly graphite (C) with quartz and mica

AI-generated identification · may be incorrect

Dark gray to silvery, strongly sparkly and foliated, with platy flakes and a greasy-to-metallic luster; graphite is Mohs 1–2, while quartz is about 7. The specimen appears fine-grained and irregularly fractured; specific gravity is commonly about 2.2–2.8.

Identified September 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when carbon-rich sedimentary material was metamorphosed under elevated temperature and pressure, commonly during mountain building; its exact geological age cannot be determined from the image. Graphite may recrystallize from ancient organic carbon or form through metamorphic fluid reactions.

Uses & applications

Used as a source of graphite for lubricants, refractories, batteries, crucibles, and pencils; attractive pieces are collected, though this small rough fragment has limited gem value.

Geological facts

Graphite conducts electricity and leaves a dark streak, unlike most silvery minerals. It can resemble metallic ore minerals such as molybdenite, so confirmation requires streak, hardness, and possibly chemical testing.

Field identification & locations

Likely graphite schist from a metamorphic belt; common graphite localities include Sri Lanka, Madagascar, Canada, China, Brazil, and the United States. Test whether it marks paper, feels greasy, and has a dark gray streak; avoid assuming it is galena without density testing.