Galenobismutite - Vulcano Island, Italy - Exposed in the Mineralogical Museum, Bonn, Germany — Photo: Ra'ike (see also: de:Benutzer:Ra'ike ) · CC BY-SA 3.0
Galenobismutite
Galenobismutite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula PbBi₂S₄.
It crystallizes in the orthorhombic crystal system (space group Pnam). It is a member of the Kobellite structural group.
Key properties: Mohs hardness 2.5–3.5; specific gravity 7.04; Black streak; Metallic. Anisotropism: Strong. R1 –R2: (400) 48.0–51.1, (420) 47.9–51.1, (440) 47.8–51.1, (460) 47.7–51.0 luster.
IMA symbol Gbit, grandfathered status — known before the IMA’s founding, named in 1878.
Hydrothermal in origin.
It is found associated with Galena, bismuth, cosalite, aikinite, tellurobismuthite, joséite, tetradymite, tetrahedrite, gold, pyrite, quartz.
In allusion to galena and bismuth in its composition.