Pyrite
mineral · common
Quick facts
- Formula
- FeS2
- Hardness
- 6–6.5
- Luster
- Metallic
- Colors
- Brassy gold
Iron sulfide. Cubic crystals and striated faces. "Fool's gold" — denser and harder than gold, and brittle.
Greenish-black streak. Gold is malleable and has a yellow streak.
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