metamorphic

Weathered sulfide-bearing rock, likely pyrite-rich schist or quartzite

Quartz–mica rock with disseminated pyrite (FeS₂), possibly altered schist

AI-generated identification · may be incorrect

Hardness approximately 5–6 overall; metallic to earthy brassy-gray surface, granular texture, and irregular fracture. The visible yellow grains may be pyrite, but crystal form and composition cannot be confirmed from the image alone.

Identified September 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed by metamorphism and hydrothermal alteration of a silica- and sulfide-bearing protolith; age depends on locality and may range from Precambrian to younger. Such rocks commonly occur in mineralized belts and metamorphic terrains.

Uses & applications

Primarily a geological or educational specimen; pyrite-bearing material may indicate ore deposits but is rarely used directly. Quartz-rich equivalents can be used as aggregate or decorative stone.

Geological facts

Pyrite is iron sulfide, FeS₂, often called “fool’s gold,” and can weather to iron oxides and sulfuric acid. The specimen’s granular yellow-brown areas are consistent with oxidized sulfides.

Field identification & locations

Look for brassy-yellow metallic grains, high density, a dark streak, and lack of true gold malleability; a streak test and hardness test help distinguish pyrite from chalcopyrite or gold. Common settings include hydrothermal veins and metamorphosed sulfide deposits.