metamorphic
Likely graphite-rich schist
Graphitic schist; chiefly graphite and quartz/mica
AI-generated identification · may be incorrectDark gray-black, strongly foliated with platy, reflective surfaces and a metallic-to-submetallic luster; likely Mohs hardness 1–3, with graphite marking paper and feeling greasy. The reddish patch may be iron-oxide staining or a reflected inclusion; exact mineralogy requires testing.
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Physical properties
Dark gray-black, strongly foliated with platy, reflective surfaces and a metallic-to-submetallic luster; likely Mohs hardness 1–3, with graphite marking paper and feeling greasy. The reddish patch may be iron-oxide staining or a reflected inclusion; exact mineralogy requires testing.
Formation & geological history
Forms when carbon-rich sedimentary rock is metamorphosed under elevated temperature and pressure, commonly during mountain building. Its age depends on the host terrane and cannot be determined from the photograph.
Uses & applications
Primarily a collector specimen or metamorphic indicator; graphite-rich material may have industrial value for lubricants, refractories, batteries, and pencils, though this small piece is unlikely to have commercial value.
Geological facts
The conspicuous sheen and layered texture are consistent with graphite-bearing schist, but similar appearances can occur in mica schist, coal, or slag.
Field identification & locations
Check for foliation, a greasy feel, and a gray-black streak; graphite conducts electricity and marks paper, whereas mica usually does not. Common settings include metamorphic belts and carbon-rich shale zones.
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