Formula: Pb2(Fe, Zn)(AsO4)2.H2O
Origin of name: As the arsenate analogue of brackebuschite
Crystal system: Monoclinic
Crystal class: 2/m
Unit cell: a = 7.763 Å, b = 6.046 Å, c = 9.022 Å, b = 112.5°
Colour: Honey-yellow, yellow, green, brown
Diaphaneity: Semi-transparent
Luster: Resinous to adamantine
Habit: Flat lath-like crystals and platelets, microscopic
Hardness: about 4.5
Specific gravity: 6.54 (calculated)
Cleavage: 1; {010} perfect
Streak: Light brownish yellow to pale brownish
Synonyms/varieties:
Comments: Member of the brackebuschite group. Found in fissures in dolomite breccia in the oxidised zone of a dolostone-hosted hydrothermal polymetallic ore deposit; in hydrothermal polymetallic barite-fluorite deposit.
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