Pyradoketosite
Pyradoketosite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Ag₃SbS₃.
It crystallizes in the monoclinic crystal system (space group P2_1/n).
Key properties: specific gravity 5.809; Orange streak; Adamantine luster.
IMA symbol Pdk, IMA status: approved, named in 2020.
Found in a metamorphosed pyrite + baryte + iron oxide ore deposit in metadolostone.
It is found associated with Pyrargyrite, tetrahedrite-(Hg), valentinite, probable pyrostilpnite, baryte, dolomite, quartz.
The name comes from the old Greek words “πυρ” (fire) and “άδόκητος” (unforeseen), because of the unexpected occurrence of this third polymorph of Ag 3SbS3.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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