Mapiquiroite
Mapiquiroite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula (Sr,Pb)(U,Y)Fe₂(Ti,Fe³⁺)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; specific gravity 4.483; Black streak; Submetallic luster.
IMA symbol Mpq, IMA status: approved, named in 2013.
Found in hydrothermal veins cutting schist and dolostone.
It is found associated with Derbylite sphalerite, quartz (Monte Arsiccio mine); allanite-(Ce), anatase, destinezite, gypsum, monazite-(Ce), pyrite, rutile.
An acronym from the surnames of the discoverers of the first specimens, Riccardo MAzzanti (b. 1953), Luigi PIerotti (b. 1953), Ugo QUIlici (b. 1946), and Moreno ROmani (b. 1949).