Silvery grey crystal aggegates of the very rare tellurium sulphide mineral joseite-B. From: Kasejovice, Nepomuk, Plzeň-South, Plzeň Region, Czech Republic. Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Joséite-B
Joséite-B is an IMA-recognized mineral species in the sulfide class, with the chemical formula Bi₄Te₂S.
It is a member of the Tetradymite structural group.
Key properties: specific gravity 8.3.
IMA symbol Js-B, IMA status: questionable, named in 1949.
Found in quartz and skarn (Hedley, Canada).
It is found associated with Bismuth, gold, joséite, bismuthinite, ikunolite, hedleyite, pyrrhotite, arsenopyrite, molybdenite.
The name refers to the relation to joséite; “B” to distinguish it from joséite, formerly joséite-A.