General Information:
Chemical Formula:KCdCu5(AsO4)4[As(OH)2O2]-2(H2O)
Composition:(Molecular Weight = 1,201.88 gm)Potassium 3.25 %
K Cadmium 9.35 %
CdCopper 26.44 %
CuArsenic 31.17 %
AsHydrogen 0.50 %
H Oxygen 29.29 %
O Empirical Formula: KCdCu5(AsO4)4(As(OH)2O2)·2(H2O)
Environment:Single specimen found at the mine. Forms a series with calcioandyrobertsite.
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, specialist in documentation of new mineral species, in particular from low-temperature seco ndary parageneses.
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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