Wallisite
Wallisite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula CuPbTlAs₂S₅.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: specific gravity 5.71; Metallic. R1 –R2: n.d luster.
IMA symbol Wal, IMA status: approved, named in 1965.
Overgrowing other lead sulfosalts.
It is found associated with Dufrénoysite, rathite, pyrite.
The name refers to Wallis, the German name for the Swiss Canton in which the Lengenbach quarry is located.
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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