Greenlizardite
A rare sodium-aluminium sulfate discovered underground in Utah's Green Lizard mine, in uranium-mineralized Chinle-formation ore channels.
Intro adapted from Wikipedia (CC BY-SA).
Greenlizardite is an IMA-recognized mineral species in the sulfate class, with the chemical formula (NH₄)Na(UO₂)₂(SO₄)₂(OH)₂·4H₂O.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 2; White streak; Vitreous luster; optically biaxial.
IMA symbol Glz, IMA status: approved, named in 2017.
A secondary mineral on the walls of mines in U-V deposits that replaced wood and other organic material in sandstones and conglomerate (roll-front type U-V deposits).
It is found associated with Ammoniozippeite, boussingaultite, dickite, beshtauite, calcite, gypsum, fermiite, johannite, natrozippeite, oppenheimerite, plášilite, rozenite, shumwayite.
The name refers to the Green Lizard mine, the locality that provided the first specimens.