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