Pyrite-bearing Rock
Scientific Name: Iron Sulfide (FeS2)
Category: rock
Brief Description
A small rock or mineral aggregate speckled with tiny crystals of pyrite, commonly known as fool's gold, which gleam with a metallic brass-yellow luster.
Characteristics
Composed of a matrix rock embedded with small, cubic or octahedral brass-yellow metallic crystals that flash brightly in the light. It has a high specific gravity and leaves a greenish-black streak.
Habitat
Found in various geological formations worldwide, including sedimentary, metamorphic, and igneous rocks, often associated with hydrothermal veins and coal beds.
When to Find It
N/A
Conservation Status
N/A
Ecological Role
Pyrite weathering can contribute to acid rock drainage in mining areas, but naturally occurring deposits are a standard component of the earth's crust and mineral cycles.
Easily Confused With
Real gold and chalcopyrite (copper iron sulfide). Gold is much softer, malleable, leaves a golden-yellow streak, and does not fracture into cubes like pyrite.
Observation Tips
Look for glittering metallic flecks in riverbeds, cliffs, and freshly exposed stone. Use a hand lens to examine the distinct crystal faces.
Interesting Facts
Pyrite gets its name from the Greek word 'pyr', meaning fire, because it strikes sparks when hit against steel.