metamorphic
Graphite-rich schist (probable graphite flake)
Graphite (C) in graphitic schist; commonly with quartz, mica, and feldspar
AI-generated identification · may be incorrectDark gray to black, strongly reflective metallic-to-submetallic luster, and platy foliation; graphite is Mohs 1–2, has perfect basal cleavage, very low specific gravity (~2.2), and leaves a black mark. The specimen’s silvery, layered texture is consistent with graphite-bearing metamorphic rock.
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Physical properties
Dark gray to black, strongly reflective metallic-to-submetallic luster, and platy foliation; graphite is Mohs 1–2, has perfect basal cleavage, very low specific gravity (~2.2), and leaves a black mark. The specimen’s silvery, layered texture is consistent with graphite-bearing metamorphic rock.
Formation & geological history
Formed when carbon-rich sedimentary material was metamorphosed under heat and pressure, commonly during regional mountain building; age depends on locality and may range from Precambrian to younger Paleozoic rocks.
Uses & applications
Graphite is used in lubricants, refractories, batteries, pencils, and electrodes; graphitic schist is mainly a collector specimen or local industrial ore rather than a gemstone.
Geological facts
Graphite is a crystalline form of carbon and is extremely soft despite its metallic appearance. Its layered structure allows sheets to slide easily, producing its greasy feel and writing mark.
Field identification & locations
Identify it by its flaky foliation, gray-black streak, softness, and electrical conductivity; it should not fizz with acid. Common sources include Sri Lanka, Madagascar, China, Canada, Brazil, and metamorphic belts worldwide.
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