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(a) Distribution and chemical diversity (chemical composition, Fe/S valence states, and crystal symmetry) of Fe single-metal sulfides. (b) Relative abundances and locality distribution of Fe2+-, Fe3+-, and Fe2+ plus Fe3+-sulfides. Note that the valence state of arsenopyrite (Fe3+(AsS)3−) in the RRUFF mineral database is examined as (Fe2+(AsS)2−) in this review based on electric spectroscopic observations [76,77].
