Formula: Ba(UO2)2(PO4)2.12H2O
Origin of name: from composition and from Greek for falcon because it was discovered in Falkenstein (which literally means "Falcon's Stone"), Germany
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning: on {100} or {010}, lamellar
Unit cell: a = 7.01 Å, c = 20.46 Å
Colour: Yellow, yellow-green
Diaphaneity: Transparent
Luster: Pearly
Habit: Crystals thin tabular, rectangular outline, in aggregates, foliated
Hardness: 2 to 2.5
Specific gravity: 3.46
Cleavage: 2; {001} perfect, {100} distinct
Tenacity:
Streak: Light yellow
Synonyms/varieties:
Comments: fluoresces green under SW- and LW-UV, radioactive
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