Yancowinnaite
Yancowinnaite is an IMA-recognized mineral species in the arsenate class, with the chemical formula PbCuAl(AsO₄)₂OH·H₂O.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Helmutwinklerite structural group.
Key properties: Mohs hardness 3; specific gravity 3.8; Yellow streak; Vitreous luster; optically biaxial.
IMA symbol Ycw, IMA status: approved, named in 2010.
Secondary in the weathering zone of a Cu-Pb-Zn sulfide deposit.
It is found associated with Gartrellite, beudantite-segnitite, mimetite, agardite-Y, carminate, chlorargyrite.
The name refers to Yancowinna County, New South Wales, where the studied samples were collected.
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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