Mineral Information and Data:

Abernathyite  
K(UO2)AsO4 • 3H2O [CNMNC approved formula]

Named for Jess Abernathy, Moab, Utah, mine owner who found the first specimens.

IMA status : Valid species (Pre-IMA 1956) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
40.02a.09.01  
  (40) Hydrated Phosphates
  (40.02a) where A++ (B++)2 (XO4) · x(H2O), containing (UO2)++
  (40.02a.09)
  
Nickel-Strunz
(10th edition) :
08.EB.15
  (08) Phosphates, Arsenates, Vanadates
  (08.E) Uranyl Phosphates and Arsenates
  (08.EB) UO2:RO4 = 1:1
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
Unit cell: a = 7.176 Å, c = 18.126 Å
Crystal Habit: Crystals thin to thick tabular; crystalline coatings
  
Color: Yellow
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 2.5 - 3
Measured Density: 3.32 g/cm3
Cleavage: 1; {001} perfect
Streak: Pale yellow
  
Geologic Setting: A rare secondary mineral coating fractures in bleached asphaltic sandstone hosting a Colorado Plateau-type uranium deposit (Fuemrol No. 2 mine, Utah, USA).
Mineral Association: Scorodite, zeunerite, heinrichite
  
Other Properties: Radioactive.

 

Abernathyite
Origin: Temple Mountain, Emery Co., Utah, U.S.A.
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Abernathyite
Yellow platy crystals on matrix
Origin: Rivérial Uranium Prospect, Lodève, Hérault, France
Sample size: 2 x 4 cm
Photo: Diederik Visser

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