Formula: PbZnFe(AsO4)2.H2O
Origin of name: for Tsumeb Corp., Namibia
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 9.13 Å, b = 6.32 Å, c = 7.58 Å, b = 115.3°
Colour: lemon-yellow, yellow-brown or red-brown
Diaphaneity:
Luster:
Habit: intergrown subparallel crystals, in spherulitic crusts
Hardness: 4.5
Specific gravity: 5.20
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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