polyargyrite
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polyargyrite — poly·ar·gy·rite … English syllables
polyargyrite — ˌpälēˈärjəˌrīt noun ( s) Etymology: German polyargyrit, from poly + argyr + it ite : a mineral Ag24Sb2S15(?) consisting of a sulfide of antimony and silver occurring chiefly in indistinct cuboctahedrons … Useful english dictionary