Smamite
Smamite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ca₂Sb(OH)₄[H(AsO₄)₂]·6H₂O.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 3.5; specific gravity 2.72; White streak; Vitreous luster; optically biaxial.
IMA symbol Smm, IMA status: approved, named in 2019.
A supergene mineral from the oxidative weathering of primary As-mineralization [native arsenic, tennantite-tetrahedrite (fahlore), arsenides of Co and Ni, löllingite and chalcopyrite].
It is found associated with Picropharmacolite, fluckite, pharmacolite, quartz, calcite, dolomite.
The name comes from the acronym (SMAM) for the Sainte-Marie-aux-Mines district, were the mineral was found.
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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