mineral

Pyrite in Matrix (Gold-colored Chalcopyrite or Pyrite)

Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)

Hardness: 6-6.5 (Pyrite) or 3.5-4 (Chalcopyrite); Color: Brass-yellow to golden brown; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Indistinct; Specific Gravity: 4.9–5.2

Hardness: 6-6
Color: Brass-yellow to golden brown
Luster: Metallic

Identified June 1, 2026More mineral →

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Physical properties

Hardness: 6-6.5 (Pyrite) or 3.5-4 (Chalcopyrite); Color: Brass-yellow to golden brown; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Indistinct; Specific Gravity: 4.9–5.2

Formation & geological history

Formed in hydrothermal veins, as an accessory mineral in igneous rocks, and in metamorphic rocks. Often associated with quartz and other sulfide minerals.

Uses & applications

Major ore of sulfur (for sulfuric acid) and copper; highly popular as a collector specimen and used in ornamental carvings and jewelry.

Geological facts

Often called Fool's Gold because its color resembles real gold, though it is much harder and more brittle. It can create sparks when struck against steel.

Field identification & locations

Identify by its metallic luster, golden-brass color, and green-black streak. Rubbing it against a streak plate will distinguish it from gold, which leaves a yellow streak.

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Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

metamorphic