metamorphic

Graphitic schist (probable)

Graphite-bearing mica schist; predominantly carbon (C) with mica, quartz, and possibly sulfides

AI-generated identification · may be incorrect

Dark gray to black, foliated and flaky, with subdued metallic to earthy luster and silvery reflective surfaces. Typical hardness is about 1–3 for graphite-rich material; specific gravity commonly 2.2–2.8. Exact identification is limited by the photograph.

Identified September 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when carbonaceous shale or mudstone underwent regional metamorphism, commonly during mountain building; age depends on the source terrain and cannot be determined visually. Graphite crystallized from metamorphosed organic carbon.

Uses & applications

Graphite is used in refractories, lubricants, batteries, electrodes, and pencils; schist is generally a decorative or collector stone rather than a major construction aggregate.

Geological facts

Graphite can mark paper and feel greasy; it is electrically conductive. A streak test, hardness test, and examination of foliation help distinguish it from coal, slate, and metallic sulfide ores.

Field identification & locations

Likely occurrences include metamorphic belts worldwide, especially Canada, the United States, Brazil, Madagascar, India, and Scandinavia. Check for a dark-gray streak, flexible graphite flakes, and mica sparkle; avoid assuming graphite if the streak is brown or red.