xanthoconite

noun
xan·​thoc·​o·​nite | \zanˈthäkəˌnīt\
plural -s

Definition of xanthoconite 

: a cochineal-red to orange-yellow to brown mineral Ag3AsS3 consisting of a silver arsenic sulfide and occurring in tabular crystals and often flat rhombohedrons — compare proustite

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History and Etymology for xanthoconite

German xanthokon xanthoconite (from xanth- + Greek konis dust) + English -ite; from the color of its streak powder

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