Spriggite
A lead uranyl hydroxide named for geologist Reginald Sprigg, from South Australia's Mount Painter.
Intro adapted from Wikipedia (CC BY-SA).
Spriggite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Pb₃(UO₂)₆O₈(OH)₂·3H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c).
Key properties: Mohs hardness 4; specific gravity 7.64; Pale orange streak; Vitreous luster.
IMA symbol Sgg, IMA status: approved, named in 2002.
Secondary mineral from the supergene alteration of U-Nb-REE-bearing hydrothermal hematite breccia.
It is found associated with Beta-uranophane, soddyite, kasolite, Ce-rich francoisite-(Nd), metatorbernite, billietite, Ba-bearing boltwoodite, schoepite, metaschoepite, weeksite,.
The mineral was named to honor geologist and conservationist Reginald Claude Sprigg (1919-1994), founder of the Arkaroola Tourist Station.