Formula: Pb3U8O27 . 10H2O
Origin of name: For G. Masuy, Belgian geologist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning: Very common on {110} or {1-30}; on {001}, contact, repeated
Unit cell: a = 13.98 Å, b = 12.11 Å, c = 14.20 Å
Colour: Reddish orange to carmine red
Diaphaneity:
Luster:
Habit: Crystals tabular, pseudohexagonal, minute
Hardness:
Specific gravity: 5.08
Cleavage: 2; {001} perfect, {010} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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