polyargyrite

noun

poly·​ar·​gy·​rite

ˌpälēˈärjəˌrīt

plural -s

: a mineral Ag₂₄Sb₂S₁₅(?) consisting of a sulfide of antimony and silver occurring chiefly in indistinct cuboctahedrons

Word History

Etymology

German polyargyrit, from poly- + argyr- + -it -ite

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