Pyrite

Widely known as fool's gold, pyrite is the most common sulfide mineral, an iron sulfide (FeS2) whose metallic luster and pale brass-yellow color give it a superficial resemblance to gold. It crystallizes in the cubic system as cubes, pyritohedra, or octahedra and shows a greenish-black to brownish-black streak, indistinct cleavage, and a Mohs hardness of 6 to 6.5. Its specific gravity ranges from 4.95 to 5.10. Pyrite occurs in all rock types and serves as a significant source of both iron and sulfur, the latter recovered for sulfuric acid production. Unlike true gold, it is brittle, hard enough to scratch glass, and shows a dark streak that betrays its identity.

'바보의 금'으로 알려진 황철석은 가장 흔한 황화물 광물이다. 금속 광택과 옅은 황동색이 금과 표면적으로 유사하다. 모든 암석 유형에서 산출되며 철과 황의 중요한 원천이다.