Yellow green crystals of the new mineral magnesioleydetite (IMA 2017-063) intermixed with also yellow green crystals of the also new mineral strassmannite, (IMA 2017-086). Analyzed specimen, see copy enclosed. Acicular white mineral associated is pickeringite. From: Widowmaker Mine, Fry Mesa, White Canyon, San Juan County, Utah, United States of America. — Photo: David Hospital · CC BY-SA 4.0
Magnesioleydetite
Magnesioleydetite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Mg(UO₂)(SO₄)₂·11H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Leydetite structural group.
Key properties: Mohs hardness 2; specific gravity 2.463; White streak; Vitreous luster.
IMA symbol Mley, IMA status: approved, named in 2017.
A secondary phase on asphaltum found in efflorescent crusts on the surfaces of mine walls.
It is found associated with Straβmannite, arsenuranospathite, gypsum, metakahlerite, nováčekite-II, uramarsite.
Identifies the magnesium-analogue of leydetite.