Cupromolybdite
Cupromolybdite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Cu²⁺₃O(Mo⁶⁺O₄)₂.
It crystallizes in the orthorhombic crystal system (space group Pnma). It is a member of the Vergasovaite structural group.
Key properties: Mohs hardness 3; specific gravity 4.512; Yellow to light brown streak; Adamantine. Anisotropism: Distinct luster.
IMA symbol Cmyb, IMA status: approved, named in 2011.
A fumarolic mineral developed during post-volcanic degassing.
It is found associated with Piypite, fedotovite, vergasovite, hematite, magnetite, aphthitalite, langbeinite, palmierite, As-bearing orthoclase, lammerite, klyuchevskite.
The name refers to its chemical composition. The name also reflects the stoichiometric relationship with cuprotungstite, Cu3(OH)2(WO4)2.