Sidpietersite
Sidpietersite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Pb²⁺₄(S₂O₃)O₂(OH)₂.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 1–2; specific gravity 6.765; White to cream-white streak; Vitreous to pearly luster.
IMA symbol Sdp, IMA status: approved, named in 1998.
A very rare late-stage alteration product of galena in the oxidized zone of a dolostone-hosted hydrothermal polymetallic ore deposit.
It is found associated with Smithsonite, zincite, greenockite, galena, sphalerite, quartz.
The mineral was named to honor Sidney Pieters (1920–2003), Windhoek, Namibia, prominent dealer in Tsumeb minerals.
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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