[1] A group which have similar appearing formulas are the sulfarsenides (for example cobaltite (Co,Fe)AsS).
In sulfarsenides the arsenic substitutes for sulfide anions whereas in the sulfosalts the arsenic substitutes for a metal cation.
Examples include:[3] IMA-CNMNC proposes a new hierarchical scheme (Mills et al., 2009).
This list uses the Classification of Nickel–Strunz (mindat.org, 10 ed, pending publication).
Many sulfosalts can be prepared in the laboratory, including many that do not occur in nature.[4][which?]