Somersetite
Somersetite is an IMA-recognized mineral species in the carbonate class, with the chemical formula Pb₈O(OH)₄(CO₃)₅.
Key properties: Mohs hardness 3; specific gravity 7.01; White streak; Adamantine luster; optically biaxial.
IMA symbol Sse, IMA status: approved, named in 2017.
Found in hydrothermal veins of remobilized components derived from older veins containing galena, fluorite, calcite and baryte, hosted by limestone.
It is found associated with Plumbonacrite, cerussite, symesite, mereheadite, diaboleite, mimetite, calcite, aragonite, quartz, baryte.
The name refers to the county of Somerset in South West England where the first specimens 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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