metamorphic

Graphitic schist (probable)

Graphite-bearing mica schist; predominantly quartz, mica, and graphite

AI-generated identification · may be incorrect

Dark gray to black, strongly foliated, with silvery reflective mica/graphite flakes and uneven cleavage. Typical hardness is about 2–3 for graphite-rich surfaces and 4–6 for the silicate matrix; luster ranges from metallic-submetallic to pearly, and specific gravity is roughly 2.6–2.8.

Identified September 22, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when carbonaceous shale or mudstone was buried and metamorphosed under elevated temperature and pressure, commonly during mountain building. Its exact geological age cannot be determined from the photograph.

Uses & applications

Used locally as decorative stone, landscaping material, and occasionally as a source of graphite; attractive pieces may be sold as mineral specimens. It is generally unsuitable for durable construction if highly foliated or crumbly.

Geological facts

Graphite produces the silvery sheen, dark streak, and greasy feel, while mica contributes bright plate-like reflections. A streak test on unglazed porcelain can help distinguish graphite from metallic sulfides.

Field identification & locations

Common in metamorphic belts worldwide, including Canada, the United States, Brazil, India, Madagascar, and Scandinavia. Check for foliation, flexible reflective flakes, and a dark gray-to-black streak; confirm with hardness and conductivity tests.