Black metallic crystal aggregates of the rare sulphide mineral gladite from the type locality in Gladhammer (Gladhammar Mines, Västervik, Kalmar County, Sweden). — Photo: David Hospital · CC BY-SA 4.0
Gladite
Gladite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula CuPbBi₅S₉.
It crystallizes in the orthorhombic crystal system (space group Pbnm). It is a member of the Meneghinite structural group.
Key properties: Mohs hardness 2–3; specific gravity 6.96; Black streak; Metallic. R1 –R2: (400) 44.0–46.0, (420) 44.6–46.1, (440) 44.9–46.2, (460) 45.1–46.3, (480) 45.1–46.4, (500) 45.1–46.6 luster.
IMA symbol Gld, grandfathered status — known before the IMA’s founding, named in 1924.
Hydrothermal in origin.
It is found associated with Bismuthinite-aikinite, galenobismutite, makovickyite, nuffieldite, berryite, galena, quartz.
The name refers to the original locality, Gladhammar, Sweden.