Metallic crystals of the rare silver mineral owyheeite. From: Crown Point, Idaho, United States of America. — Photo: David Hospital · CC BY-SA 4.0
Owyheeite
Owyheeite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Ag₃Pb₁₀Sb₁₁S₂₈.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: Mohs hardness 2.5; specific gravity 6.22–6.51; Reddish brown streak; Metallic luster.
IMA symbol Owy, grandfathered status — known before the IMA’s founding, named in 1920.
Found in veins of hydrothermal origin.
It is found associated with Galena, sphalerite, pyrite, arsenopyrite, chalcopyrite, tetrahedrite, pyrargyrite, diaphorite, miargyrite, jamesonite, boulangerite, ramdohrite, andorite.
The name is derived from the locality in Owyhee Co., Idaho, USA.