Mopungite Locality: Green prospect, Lake District, Churchill Co., Nevada, USA White crust of Mopungite on Stibnite. Field of view 15 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Mopungite
Mopungite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula NaSb⁵⁺(OH)₆.
It crystallizes in the tetragonal crystal system (space group P4_2/n). It is a member of the Perovskite structural group.
Key properties: Mohs hardness 3; specific gravity 3.21; Vitreous luster; optically uniaxial.
IMA symbol Mop, IMA status: approved, named in 1982.
An oxidation product of stibnite.
It is found associated with Selenium, sulfur, stibiconite, sénarmontite, roméite, tripuhyite (Mopung Hills, Nevada, USA); cetineite, sénarmontite, brizziite.
The name refers to the Mopung Hills, Nevada, USA, where it was first found.