Sulphate, uranyl sulphate, lithium-bearing mineral
Specific gravity: 2.97 calculated
Streak: Very pale yellow
Colour: Light yellow
Seaborgite is a relatively new mineral, approved in 2019 and to date (June 2022) reported only from the type
At the type locality, the Blue Lizard Mine, Red Canyon Mining District, San Juan County, Utah, USA, seaborgite was found in a post-mining oxidation zone in the sandstone beds. These beds are rich in bitumen with uraninite and sulphide minerals. Seaborgite likely formed from evaporation during dry periods in the usually damp mine. This is the first uranium-bearing mineral that contains structurally essential lithium. It is postulated that the lithium could have migrated from lithium-bearing clays within, or nearby, the deposit by way of hydrothermal fluid circulation (AM 107.320).
The seaborgite occurs as sprays of light-yellow, long flattened prisms or blades, up to about 0.2 mm in length. Associated minerals include römerite, metavoltine, ivsite, gypsum, ferrinatrite and copiapite (Mindat).
Back to Minerals