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Thioarsenite is the trianion AsS33−. It is a pyramidal anion, as it typical for other As(III)X3 compounds. It is also called sulfarsenite. It is generated by treatment of As2S3 with sulfide:
As2S3 + 3 S2− → 2 AsS33−Thioarsenites are components of many sulfosalt minerals. An example is relatively common mineral proustite, Ag3AsS3.
References
Thioarsenite Wikipedia(Text) CC BY-SA