Magnesiopascoite Locality: Blue Cap Mine, La Sal Creek Mining District, San Juan County, Utah, USA Field of view 4 mm. Ex Joe Marty specimen. — Photo: Leon Hupperichs · CC BY-SA 3.0
Magnesiopascoite
A bright-orange hydrated calcium-magnesium decavanadate from Utah — the magnesium analogue of pascoite.
Intro adapted from Wikipedia (CC BY-SA).
Magnesiopascoite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Ca₂MgV⁵⁺₁₀O₂₈·16H₂O.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Pascoite structural group.
Key properties: Mohs hardness 2.5; specific gravity 2.43; Yellow streak; Adamantine luster; refractive index 2.471; optically biaxial.
IMA symbol Mpas, IMA status: approved, named in 2007.
Product of groundwater leaching and oxidation of vanadium oxides in a post-mining environment.
It is found associated with Gypsum, rossite, pyrite, montroseite, martyite.
As the magnesium analog of pascolite.