metamorphic
Graphitic schist
Graphite-rich pelitic schist; primarily quartz, mica, and graphite
AI-generated identification · may be incorrectDark gray to black, strongly foliated with silvery reflective mica/graphite flakes; typically Mohs 2–3 for graphite-rich surfaces, with variable hardness up to ~6 for quartz. Nonmetallic to submetallic luster, layered texture, and perfect schistose cleavage; density commonly ~2.6–2.8 g/cm³.
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Physical properties
Dark gray to black, strongly foliated with silvery reflective mica/graphite flakes; typically Mohs 2–3 for graphite-rich surfaces, with variable hardness up to ~6 for quartz. Nonmetallic to submetallic luster, layered texture, and perfect schistose cleavage; density commonly ~2.6–2.8 g/cm³.
Formation & geological history
Formed when carbon-rich shale or mudstone was subjected to regional metamorphism, causing recrystallization and alignment of mica and graphite; commonly Paleozoic or older, though age depends on locality.
Uses & applications
Used locally as decorative stone or aggregate, but usually collected as a geological specimen; graphite-rich varieties may have limited industrial graphite interest.
Geological facts
Graphite produces a gray-black streak and can mark paper, unlike most metallic-looking minerals. The white bands are likely quartz veins or felsic mineral layers.
Field identification & locations
Look for planar foliation, sparkly flakes, softness, and a dark streak; a streak test and hand lens help distinguish it from metallic ore. Common in metamorphic belts worldwide, including Canada, Scandinavia, the United States, and India.
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