Trithioarsenite

Trithioarsenite, also called sulfarsenite, is the trianion AsS3−3. It is a pyramidal anion, as is typical of other As^IIIX₃ compounds. It is generated by treatment of As₂S₃ with a sulfide:

As₂S₃ + 3 S²⁻ → 2 AsS3−3

Thioarsenites are components of many sulfosalt minerals. An example is relatively common mineral proustite, Ag₃AsS₃,^[1]^[2]^[3] which is silver(I) trithioarsenite.

References

^ Mindat
^ Webmineral
^ Trevelyan B. 1969: The electro-optic effect in proustite. Optical and Quantum Electronics, 1(1), pp. 1969; [1]

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[1] Mindat

[2] Webmineral

[3] Trevelyan B. 1969: The electro-optic effect in proustite. Optical and Quantum Electronics, 1(1), pp. 1969; [1]

[1]

[2]

[3]