metamorphic

Weathered sulfide-bearing metamorphic rock (likely pyrite- or chalcopyrite-rich schist)

Quartz–mica schist with iron sulfides; possible pyrite (FeS₂) and chalcopyrite (CuFeS₂)

AI-generated identification · may be incorrect

Hardness is approximately 3–6 overall, with brassy yellow metallic grains, gray matrix, and irregular fracture; likely foliated, though weathering obscures the fabric. Yellow-brown surface staining suggests oxidation to iron oxides/hydroxides.

Identified September 4, 2026More metamorphic →

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At a glance

Common name: Weathered sulfide-bearing metamorphic rock (likely pyrite- or chalcopyrite-rich schist)
Scientific name: Quartz–mica schist with iron sulfides; possible pyrite (FeS₂) and chalcopyrite (CuFeS₂)
Category: metamorphic
Identified: September 4, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a common unverified specimen; higher only if confirmed to contain attractive crystals or economically significant minerals.

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

Probably formed when a clay- or volcanic-rich sediment was metamorphosed and sulfide minerals crystallized during hydrothermal or metamorphic alteration. The exact geological age cannot be determined from the image.

Uses & applications

Primarily a teaching or collecting specimen; sulfide-bearing rocks can be indicators of copper, gold, or other ore deposits, but this fragment is not demonstrably ore-grade.

Geological facts

Pyrite is commonly called “fool’s gold,” while chalcopyrite is a major copper ore and often tarnishes to iridescent colors. Sulfide oxidation can produce rusty coatings and acidic drainage.

Field identification & locations

Look for metallic brassy grains, streak, density, and possible foliation; pyrite has a dark greenish-black streak, whereas chalcopyrite is softer and often iridescent. Common in hydrothermal veins and metamorphosed volcanic or sedimentary terrains.