Pyrite is a very common mineral (also one of the most common natural sulfides, and the most common disulfide), found in a wide variety of geological formations from sedimentary deposits to hydrothermal veins and as a constituent of metamorphic rocks. The brassy-yellow metallic colour of pyrite has in many cases lead to people mistaking it for Gold, hence the common nickname 'Fool's gold'. Pyrite is quite easy to distinguish from gold: pyrite is much lighter, but harder than gold and cannot be scratched with a fingernail or pocket knife.
Pyrite is commonly found to contain minor nickel, and forms a series with Vaesite, NiS2; Bravoite is a Ni-bearing variety of pyrite. It usually contains minor cobalt too and forms a series with Cattierite, CoS2. Many pyrites contain minor As, see Arsenic-bearing Pyrite. "Pb-bearing" pyrite has been described by Cabral et al. (2011) and Pačevski et al. (2012). It can also contain traces of other metals, including gold. Most of the foreign metal contents in pyrite can be traced back to metal nanoparticles (Deditius et al., 2011; Pačevski et al., 2012).
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