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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Merriam-Webster unabridged
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