Formula: PbAlF3(OH)2
Origin of name: For Arthur Roe (1912-1993), American chemist and amateur mineralogist, Tucson, Arizona, USA
Crystal system: Triclinic
Crystal class: -1
Twinning: Common, by rotation about [010] with composition plane {100}
Unit cell: a = 6.270 Å, b = 6.821 Å, c = 5.057 Å, a = 90.68°, b = 107.69°, g = 104.46°
Colour: Colourless
Diaphaneity: Semi-transparent
Hardness: about 2.5
Specific gravity: 5.36
Cleavage: 2; {100} perfect, {010} good
Streak: White
Synonyms/varieties:
Comments: Occurs in the oxidised zone of an epithermal Cu-Pb-Ag deposit.
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