igneous
Pyrite vein in basalt
Iron sulfide (FeS2) in mafic volcanic rock
AI-generated identification · may be incorrectHardness of 6-6.5 for pyrite, metallic luster, brass-yellow color, and opaque with a cubic crystal system.
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Physical properties
Hardness of 6-6.5 for pyrite, metallic luster, brass-yellow color, and opaque with a cubic crystal system.
Formation & geological history
Formed via hydrothermal fluid deposition filling fractures within cooling volcanic basalt over millions of years.
Uses & applications
Used primarily as mineral specimens for geological collections and educational displays.
Geological facts
Commonly known as fool's gold due to its deceptive metallic sheen, pyrite produces a brownish-black streak.
Field identification & locations
Identify in the field by its distinct brassy metallic luster, high hardness that scratches glass, and brittle tenacity.
