metamorphic
Raw graphite-rich metamorphic rock (probable graphite schist)
Graphite schist; predominantly crystalline carbon (graphite, C) with mica and quartz
AI-generated identification · may be incorrectDark gray to black, flaky and weakly metallic/greasy luster; graphite has Mohs hardness 1–2 and leaves a gray-black streak. Schistosity and platy graphite/mica grains are visible, though the specimen appears compact and weathered.
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Physical properties
Dark gray to black, flaky and weakly metallic/greasy luster; graphite has Mohs hardness 1–2 and leaves a gray-black streak. Schistosity and platy graphite/mica grains are visible, though the specimen appears compact and weathered.
Formation & geological history
Forms when carbon-rich sedimentary rocks are metamorphosed under elevated temperature and pressure, commonly during mountain building; age depends on its host terrane and cannot be determined from the image.
Uses & applications
Used as a source of graphite for lubricants, refractories, batteries, pencils, and conductive materials; attractive pieces are mainly collector specimens.
Geological facts
Graphite is the stable, layered crystalline form of carbon and is extremely soft despite being chemically related to diamond.
Field identification & locations
Identify by its black streak, very low hardness, greasy feel, and tendency to mark paper; unlike coal, it is crystalline and commonly foliated. Common localities include Sri Lanka, Madagascar, Canada, Norway, and the United States.
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