Formula: PbCu(AsO4)(OH)
Origin of name: For G. Duft, Tsumeb, S. A.
Crystal system: Orthorhombic
Crystal class: 222
Twinning:
Unit cell: a = 7.61 Å, b = 9.19 Å, c = 6.08 Å
Colour: Apple-green to olive-green to grayish green
Diaphaneity:
Luster: Vitreous to dull
Habit: Crystals rough, rounded, minute; crusts and aggregates
Hardness: 3
Specific gravity: 6.40
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties: Alpha-duftite, arsentsumebite
Comments:
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