metamorphic
Graphite-bearing metamorphic rock, likely graphitic schist
Graphitic schist; chiefly quartz, mica, feldspar, and graphite (C)
AI-generated identification · may be incorrectDark gray to black, strongly foliated and sparkly with a metallic-to-submetallic sheen from graphite and mica; graphite is very soft (Mohs 1–2), while quartz is Mohs 7. Graphite leaves a dark streak and feels greasy; the specimen has an irregular schistose texture rather than visible large crystals.
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Physical properties
Dark gray to black, strongly foliated and sparkly with a metallic-to-submetallic sheen from graphite and mica; graphite is very soft (Mohs 1–2), while quartz is Mohs 7. Graphite leaves a dark streak and feels greasy; the specimen has an irregular schistose texture rather than visible large crystals.
Formation & geological history
Formed when carbon-rich shale or mudstone underwent regional metamorphism, recrystallizing into schist and graphite-bearing layers. Ages vary widely, commonly Precambrian to Paleozoic depending on locality.
Uses & applications
Used locally as a source of graphite, refractory material, lubricants, and electrodes; attractive pieces may be collected, but this rough specimen has limited jewelry value.
Geological facts
Graphite is elemental carbon with the same composition as diamond, but its sheet-like crystal structure makes it soft and electrically conductive.
Field identification & locations
Common in metamorphic belts worldwide, including Canada, the United States, Brazil, Madagascar, and Scandinavia. Confirm with a streak test on unglazed porcelain, softness, conductivity, and visible foliation; exact identification requires testing for graphite versus sulfides or mica.
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