metamorphic
Graphitic schist (probable)
Graphite-bearing mica schist; chiefly quartz, mica, and graphite
AI-generated identification · may be incorrectDark gray to black, strongly foliated and flaky, with silvery reflective mica/graphite surfaces; hardness is typically 2–3 for graphite-rich layers and 5–7 for quartz-bearing portions, with a greasy to submetallic luster.
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Physical properties
Dark gray to black, strongly foliated and flaky, with silvery reflective mica/graphite surfaces; hardness is typically 2–3 for graphite-rich layers and 5–7 for quartz-bearing portions, with a greasy to submetallic luster.
Formation & geological history
Formed when carbonaceous shale or mudstone underwent regional metamorphism, commonly during mountain building; exact geological age cannot be determined from the image.
Uses & applications
Used locally as decorative stone, aggregate, or a source of graphite; attractive pieces may be collected, though this specimen appears low grade.
Geological facts
Graphite-rich schist can mark metamorphosed organic sediments and may leave a dark streak or smudge, unlike most ordinary mica schists.
Field identification & locations
Look for planar foliation, easy splitting, sparkling mica, and possible dark graphite streak; common in metamorphic belts worldwide, including the Appalachians, Alps, and many Precambrian terrains.
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