Black metallic crystals of the very rare Ag-Pb-Bi sulphide mineral treasurite from one of the few known localities worldwide (Tyrone Mine, Burro Mountains, Grant County, New Mexico, United States of America). Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Treasurite
Treasurite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Ag₇Pb₆Bi₁₅S₃₀.
It crystallizes in the monoclinic crystal system. It is a member of the Lillianite structural group.
IMA symbol Tsur, IMA status: approved, named in 1976.
Found in hydrothermal vein material.
It is found associated with A fine-grained decomposition product of treasurite having very similar optical properties (Treasure Vault mine, Colorado, USA).
The name refers to the Treasure Vault lode, Colorado, USA, in which it occurs. Type Material: National Museum of Natural History, Washington, D.C., USA, R9714.