Arsenuranospathite

Formula:  HAl(UO₂)₄(AsO₄)₄^.40H₂O

Origin of name:  From composition and Greek for broad blade, arsenic analogue of uranospathite

Crystal system:  Orthorhombic, pseudo-tetragonal

Crystal class:  4/m

Twinning:

Unit cell: a = 7.16 Å, c = 30.37 Å

Colour:  White to pale yellow, yellowish brown

Diaphaneity: Transparent or translucent

Luster: Vitreous

Habit:  As crusts of elongated tabular crystals

Hardness:  About 2

Specific gravity:  2.54

Cleavage:  3; {001} perfect, {100} and {010} distinct

Tenacity:

Streak: White

Synonyms/varieties:

Comments: A very rare secondary mineral in uranium deposits.