metamorphic

Pyrite-bearing schist or quartzite

Micaceous quartz-rich metamorphic rock with pyrite (FeS₂)

AI-generated identification · may be incorrect

Likely composed of quartz, mica, feldspar, and abundant brassy pyrite grains. Hardness is approximately 6–7 for the silicate matrix and 6–6.5 for pyrite; metallic luster, granular texture, and weak-to-moderate foliation are visible, though crystal structure cannot be confirmed from the image.

Identified September 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sedimentary or igneous material underwent heat and pressure, with pyrite crystallizing or surviving during metamorphism. The exact geological age and grade cannot be determined visually; similar rocks occur in Precambrian to younger metamorphic belts.

Uses & applications

Mostly a collector specimen or decorative stone; pyrite may be studied as an ore mineral for sulfur and iron, but this piece is unlikely to have commercial economic value.

Geological facts

The golden metallic grains resemble pyrite (“fool’s gold”), which is harder and more brittle than true gold and commonly forms cubic crystals.

Field identification & locations

Look for glittering brassy grains, gray quartz, mica sparkle, and foliation; a streak test and hardness test help distinguish pyrite from gold. Common in hydrothermal veins and metamorphic terrains worldwide.