Formula: Pb2(SO4)F2
Origin of name: From locality; Grand Reef Mine, Arizona, U.S.
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity:
Luster: Subadamantine
Habit: Striated prismatic crystals 1.5 x 3 x 4 mm, blade-like to 7 mm
Hardness: 2.5
Specific gravity: 7.01
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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