Paseroite
Paseroite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Pb(Mn²⁺, )(Fe³⁺, )₂(V⁵⁺,Ti⁴⁺, )₁₈O₃₈.
It crystallizes in the hexagonal crystal system (space group R-3). It is a member of the Crichtonite structural group.
Key properties: Mohs hardness 6–6.5; specific gravity 4.315; Black streak; Submetallic luster; optically biaxial.
IMA symbol Psr, IMA status: approved, named in 2011.
Found in micro-cavities and fractures in a piece of fossilized wood, presumably precipitated from oxidized ground water.
It is found associated with Quartz, chalcocite, volborthite; more rarely metatyuyamunite, pyrophanite.
The mineral was named to honor Marco Pasero (b. 1958), Professor of Mineralogy, University of Pisa, Italy, for his contributions to mineralogy and crystallography in general.