metamorphic

Likely graphite-rich metamorphic rock (graphitic schist)

Graphitic schist; chiefly carbon (graphite) with quartz, mica, and possibly sulfides

AI-generated identification · may be incorrect

Dark gray-black, flaky and strongly metallic to greasy luster with sparkling platy surfaces; graphite is Mohs 1–2, while quartz is 7. Schistose foliation is visible, and graphite commonly leaves a gray-black streak and conducts electricity.

Identified September 16, 2026More metamorphic →

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At a glance

Common name: Likely graphite-rich metamorphic rock (graphitic schist)
Scientific name: Graphitic schist; chiefly carbon (graphite) with quartz, mica, and possibly sulfides
Category: metamorphic
Identified: September 16, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common hand specimen; $30–$100+ for unusually lustrous, well-foliated, or locality-labeled material.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Formed when carbon-rich sedimentary rocks were subjected to regional metamorphism, recrystallizing organic carbon into graphite; ages vary widely, commonly Precambrian to Paleozoic.

Uses & applications

Used as a graphite source for lubricants, refractories, electrodes, pencils, and batteries; attractive specimens are collected but are not typically jewelry grade.

Geological facts

Graphite is the soft, conductive form of carbon, unlike diamond, which is hard and nonconductive. The reflective flakes can resemble metallic ore minerals.

Field identification & locations

Test for a dark gray streak, very low hardness, and electrical conductivity; a magnet test may help exclude magnetite, while acid and streak tests distinguish sulfides. Common in metamorphic belts worldwide, including Canada, the United States, Brazil, India, Madagascar, and Sri Lanka.