metamorphic

Metallic sulfide-bearing metamorphic rock

Likely graphitic schist or sulfide-rich schist, with possible pyrite/arsenopyrite and mica

AI-generated identification · may be incorrect

Dark gray, foliated, and strongly sparkly with metallic to submetallic luster; likely hardness 3–6 depending on sulfide and mica content. The yellow-brassy grains may be pyrite or arsenopyrite, while silver flakes may be mica or graphite; exact identification requires testing.

Identified September 16, 2026More metamorphic →

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At a glance

Common name: Metallic sulfide-bearing metamorphic rock
Scientific name: Likely graphitic schist or sulfide-rich schist, with possible pyrite/arsenopyrite and mica
Category: metamorphic
Identified: September 16, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common hand specimen; $30–$150+ if it contains well-formed metallic crystals or comes from a documented locality.

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

Likely formed when shale or another sedimentary protolith was regionally metamorphosed, concentrating sulfide minerals along foliation. Age and locality cannot be determined from the photograph.

Uses & applications

Used mainly as a mineralogical or educational specimen; sulfide-rich rocks can indicate ore deposits but are generally unsuitable for construction. Attractive pieces may be collected for metallic luster and texture.

Geological facts

Pyrite is iron sulfide (FeS₂) and commonly forms brassy cubes, whereas arsenopyrite (FeAsS) is more silver-gray and may produce a garlic-like odor when struck. Some sulfide minerals can release acid or toxic elements during weathering.

Field identification & locations

Look for foliation, flaky mica/graphite, and brassy metallic grains; a streak, hardness, magnetism, and acid test would help distinguish pyrite, arsenopyrite, chalcopyrite, and graphite. Common settings include metamorphic belts near hydrothermal ore systems.