Cannizzarite Locality: Kudriavy (Kudryavyi) volcano, Iturup Island , Kuril Islands , Sakhalinskaya Oblast' , Far-Eastern Region, Russia ( Locality at mindat.org ) Size: 7.4 x 4.0 x 3.9 cm. This is a remarkably rich, sparkling specimen just smothered with sharp microcrystals of this rare species (to perhaps 1mm). This location has also given us rheniite, and is a very important occurrence for rare metallic species formed from the volcanic vents here. Analyzed and from the inventory of Josef Vajdak. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Cannizzarite
Cannizzarite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Pb₈Bi₁₀S₂₃.
It crystallizes in the monoclinic crystal system (space group P2_1/m).
Key properties: Mohs hardness 2; specific gravity 6.7; Metallic. Anisotropism: Strong, from blue to gray. R1 –R2: (400) 49.2–51.3, (420) 49.8–52.4, (440) 50.4–53.5 luster.
IMA symbol Cnz, grandfathered status — known before the IMA’s founding, named in 1924.
in association with deep fumarolic activity (Vulcano, Italy); in sulfide veinlets in a greisen Sn–W deposit in granite (Shumilovsk deposit, Russia).
It is found associated with Lillianite, mozgovaite, kirkiite, barberiite, galenobismutite, bismuthinite, galena, gold, tellurium (Vulcano, Italy); wolframite, cassiterite, bismuthinite.
The mineral was named to honor Stanislao Cannizzaro (1826–1910), celebrated Italian chemist, University of Rome, Italy.