Symesite
Symesite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Pb₁₀(SO₄)O₇Cl₄·H₂O.
It crystallizes in the triclinic crystal system (space group B-1).
Key properties: Mohs hardness 4; specific gravity 7.3; White streak; Vitreous luster.
IMA symbol Sy, IMA status: approved, named in 1998.
A secondary low-temperature mineral formed from metalliferous brines moving along fractures through Mn and Fe-oxide mineral deposits in limestone.
It is found associated with Cerussite, hydrocerussite, paralaurionite, blixite, chloroxiphite, pyrolusite, coronadite, hematite, parkinsonite, mereheadite.
The mineral was named to honor Robert Symes (1937–) of the Department of Mineralogy, the Natural History Museum (London, England).
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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