Trithioarsenite
Introduction Subunit of the structure of proustite, a sulfosalt mineral. This picture shows the connectivity of the trithioarsenite trianion to  (arsenic is colored violet). '''Trithioarsenite''', also called '''sulfarsenite''', is the trianion . It is a pyramidal anion, as is typical of other  compounds. It is generated by treatment of  with a sulfide::A fundamental synthetic trithioarsenite is , which features the pyramidal .Thioarsenites are components of many sulfosalt minerals. An example is relatively common mineral proustite, , which is silver(I) trithioarsenite.
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