Abernathyite

Formula: K₂(UO₂)₂(AsO₄)₂^.6H₂0

Origin of name:  for Jess Abernathy, American mine operator who found the first specimens, Moab, Utah, USA

Crystal system:  Tetragonal

Crystal class:  4/m 2/m 2/m

Twinning:

Unit cell:  a = 7.176 Å, c = 18.126 Å

Colour:  Yellow 

Diaphaneity: Transparent

Luster:  Vitreous

Habit:  Crystals thin to thick tabular;  crystalline coatings

Hardness:  2.5 to 3

Specific gravity:  above 3.32

Cleavage:  1;  {001} perfect

Tenacity:

Streak:  Pale yellow

Synonyms/varieties:

Comments:  Fluoresces yellow-green in SW UV. Member of the meta-autunite group. A rare secondary mineral coating fractures in bleached asphaltic sandstone hosting a Colorado Plateau-type uranium deposit.