Formula: HAl(UO2)4(PO4)4.40H2O
Origin of name: from uranium and from Greek spathe for broad blade or sword
Crystal system: Tetragonal
Crystal class: 4/m (probable)
Twinning: May be twinned on {110} forming cruciform groupings
Unit cell: a = 7.00 Å, c = 30.02 Å
Colour: Yellow to pale green, bluish green
Diaphaneity: Translucent
Luster:
Habit: Crystals lath-like or thin rectangular plates, elongated along b-axis, in fan-like groups
Hardness: 2 to 2.5
Specific gravity: 2.50
Cleavage: 3; {001} perfect, {100} good, {010} fibrous, good
Tenacity:
Streak: Yellow white
Synonyms/varieties:
Comments: Yellowish green fluorescence under UV, radioactive, readily dehydrates to sabugalite
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