metamorphic
Graphite-rich schist (likely graphite ore)
Graphite-bearing schist; predominantly graphitic carbon (C) with mica, quartz, and possible feldspar
AI-generated identification · may be incorrectDark gray to black, platy and flaky with a bright metallic to submetallic sheen; commonly fol||||Hardness 1–2 for graphite-rich surfaces, though associated silicates are harder (up to ~7). Graphite has hexagonal crystal structure, perfect basal cleavage, and very low specific gravity (~2.2).
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Physical properties
Dark gray to black, platy and flaky with a bright metallic to submetallic sheen; commonly fol||||Hardness 1–2 for graphite-rich surfaces, though associated silicates are harder (up to ~7). Graphite has hexagonal crystal structure, perfect basal cleavage, and very low specific gravity (~2.2).
Formation & geological history
Formed when carbon-rich sedimentary rocks were metamorphosed, recrystallizing organic carbon into graphite. Such rocks may range from Precambrian to younger metamorphic ages; age cannot be determined from the image.
Uses & applications
Graphite is used in refractories, lubricants, batteries, electrodes, and pencils; attractive schist specimens are collected, though these pieces appear mostly ore-grade rather than gem material.
Geological facts
Graphite marks the rock with a dark streak and greasy feel; it can soil fingers, unlike metallic sulfides. The shiny flakes may also include biotite or muscovite, so a streak and hardness test are useful.
Field identification & locations
The angular, foliated fragments strongly support schist or graphite-rich metamorphic rock. Around 28.5°N, 77.2°E, transported construction aggregate or imported ore is more likely than local bedrock; confirm with a black streak, softness, and absence of magnetism.
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