Abernathyite , Heinrichite Field of view: 3 mm Locality: Riviéral, Lodève, Hérault, Languedoc-Roussillon, France Description: Pale yellow abernathyite crystals and green heinrichite crystals in the center of the cluster — Photo: Leon Hupperichs · CC BY-SA 3.0
Abernathyite
A potassium uranyl arsenate first noticed by prospector Jesse Abernathy in Utah in 1953 and recognized as a new species in 1956.
Intro adapted from Wikipedia (CC BY-SA).
Abernathyite is an IMA-recognized mineral species in the arsenate class, with the chemical formula K(UO₂)(AsO₄)·3H₂O.
It crystallizes in the tetragonal crystal system (space group P4/nmm). It is a member of the Natroautunite structural group.
Key properties: Mohs hardness 2–3; specific gravity 3.32; Pale yellow streak; Weakly vitreous luster; refractive index 1.592; optically uniaxial.
IMA symbol Abn, grandfathered status — known before the IMA’s founding, named in 1956.
A rare secondary mineral coating fractures in bleached asphaltic sandstone hosting a Colorado Plateau-type uranium deposit (Fuemrol No. 2 mine, Utah, USA).
It is found associated with Scorodite, zeunerite, heinrichite.
The mineral was named to honor Jess Abernathy, Moab, Utah, USA, mine owner who found the first specimens.