Siidraite
Siidraite is an IMA-recognized mineral species in the halide class, with the chemical formula Pb₂Cu(OH)₂I₃.
It crystallizes in the orthorhombic crystal system (space group Fddd).
Key properties: Mohs hardness 2.5–3.5; Yellow streak.
IMA symbol Sii, IMA status: approved, named in 2016.
Found in upper oxidation zone of a supergene-enriched, galena-Mn-silicate deposit. Likely from the oxidation of cuprite.
It is found associated with Cuprite, marshite, copper, brochantite, anglesite.
The mineral was named to honor Russian mineralogist and crystallographer Oleg. I. Siidra (b. 1981) for his extensive work on secondary lead oxysalts, in particular, synthetic iodine-rich phases.
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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