Seaborgite
Seaborgite is an IMA-recognized mineral species in the sulfate class, with the chemical formula LiK₂Na₆(UO₂)(SO₄)₅(SO₃OH)(H₂O).
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 2.5; specific gravity 2.97; Very pale yellow streak; Vitreous luster; optically biaxial.
IMA symbol Sea, IMA status: approved, named in 2020.
A secondary mineral in association with post-mining oxidation of asphaltum-rich sandstone beds laced with uraninite and sulfides in a damp underground environment.
It is found associated with Gypsum, copiapite, ferrinatrite, ivsite, metavoltine, römerite.
The mineral was named to honor American chemist Glenn T. Seaborg (1912-1999) who was involved in the synthesis, discovery, and investigation of 10 transuranium elements (including seaborgium).