General Information:
Chemical Formula:KCaCu5(AsO4)4[As(OH)2O2]-2(H2O)
Composition:(Molecular Weight = 1,129.55 gm)Potassium 3.46 %
K Calcium 3.55 %
CaCopper 28.13 %
CuArsenic 33.16 %
AsHydrogen 0.54 %
H Oxygen 31.16 %
O Empirical Formula: KCaCu5(AsO4)4(As(OH)2O2)·2(H2O)
Environment:Single specimen found at the mine. Forms a series with andyrobertsite.
IMA Status:Approved IMA (Dana # Added)
Locality:Tsumeb Mine, Tsumeb, Namibia.
Name Origin:Named after Andrew C. Roberts (1950-), mineralogist with the Geological Survey of Canada.
Physical Properties: Cleavage:[100] Good
Color:electric blue.
Density:4.011
Diaphaniety:Transparent
Habits:Platy - Sheet forms (e.g. micas)., ,
Hardness:3 - Calcite
Luminescence:Non-fluorescent.
Luster:Vitreous (Glassy)
Streak:pale blue
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