Steel gray crystals of the very rare sulphide mineral lindstromite associated to chalcopyrite. From: Beaver Lake Mountains, Beaver County, Utah, United States of America. — Photo: David Hospital · CC BY-SA 4.0
Lindströmite
Lindströmite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Pb₃Cu₃Bi₇S₁₅.
It crystallizes in the orthorhombic crystal system (space group Pbnm). It is a member of the Meneghinite structural group.
Key properties: Mohs hardness 3–3.5; specific gravity 7.01; Black streak; Metallic. R1 –R2: (400) 42.3–46.0, (420) 42.2–45.8, (440) 42.1–45.6, (460) 42.0–45.4, (480) 41.8–45.3, (500) 41.6–45.2 luster.
IMA symbol Lsm, IMA status: approved, named in 1924.
Hydrothermal in origin.
It is found associated with Krupkaite, other aikinite–bismuthinite series members, bismuth.
The mineral was named to honor Gustav Lindström (1838–1916), Swedish mineral chemist of the Swedish Museum of Natural History, Stockholm, Sweden.