mineral

Pyrite-bearing quartz vein (likely pyrite ore)

Pyrite, FeS₂, with abundant quartz (SiO₂) and possibly chalcopyrite

AI-generated identification · may be incorrect

Brassy yellow metallic crystals, granular to cubic, with gray-white quartz matrix; pyrite hardness 6–6.5, metallic luster, no cleavage, specific gravity ~5.0. Chalcopyrite may account for warmer golden areas but cannot be confirmed from the image alone.

Identified September 19, 2026More mineral →

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Physical properties

Formation & geological history

Formed when sulfur-rich hydrothermal fluids deposited sulfide minerals in fractures and veins, commonly during the Paleozoic–Mesozoic or younger mineralizing events. Exact age and locality require geological context or laboratory analysis.

Uses & applications

Collected as a mineral specimen and historically mined for sulfur, sulfuric acid, and iron; associated deposits may also contain copper, gold, or silver. It is generally unsuitable for jewelry because pyrite tarnishes and can oxidize.

Geological facts

The metallic gold appearance gives pyrite its nickname, “fool’s gold,” but pyrite is harder and more brittle than native gold. Oxidation can produce acidic runoff and yellow-brown iron sulfates.

Field identification & locations

Identify by its pale brass color, brittle fracture, metallic luster, and frequent cubic crystals; a streak test gives a greenish-black to brown-black streak, unlike gold’s yellow streak. Common in hydrothermal veins, sedimentary beds, and metamorphic sulfide deposits worldwide.