Formula: Pb2Cu4Bi(VO4)4(OH)3 . 8H2O
Origin of name: For J. Duhamel
Crystal system: Orthorhombic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Green, yellow-green
Diaphaneity:
Luster:
Habit: Crystals free standing in barrel-shaped bundles, tiny
Hardness: 3
Specific gravity: 5.80
Cleavage: None
Tenacity:
Streak: Pale yellow
Synonyms/varieties:
Comments: discredited, shown to be variety of mottramite
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