Braithwaiteite
Braithwaiteite is an IMA-recognized mineral species in the arsenate class, with the chemical formula NaCu²⁺₅(Sb⁵⁺Ti⁴⁺)O₂(AsO₄)₄[AsO₃(OH)]₂·8H₂O.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 2; specific gravity 3.44; Pale blue streak; Vitreous luster; optically biaxial.
IMA symbol Bwt, IMA status: approved, named in 2006.
Occurs as an uncommon secondary mineral in the weathering zone of a hydrothermal enargite deposit.
It is found associated with Lammerite, lavendulan-lemmereite.
The mineral was named to honor Richard S.W. Braithwaite (b. 1930), chemist and mineralogist at the University of Manchester, 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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