Pyrrhotite emically the S-analogue of acháso chemically the Fe analogue of covellite, which has the same space group. Troilite, a native iron protosulphide, and related to the species pyrrhotite (monoclinic or hexagonal Fe 1-x S x = 0 - 0.17 several polytypes known), and smythite (trigonal (Fe,Ni) 3+x S 4 x = 0-0.3). Troilite is stoichiometric FeS, without vacancies in …
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