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andyrobertsite

n. (context mineral English) A monoclinic mineral with vitreous lustre, having the chemical formula KCdCu5[H2AsO4|(AsO4)4]ยท2H2O.

Wikipedia
Andyrobertsite

Andyrobertsite is a rare, complex arsenate mineral with a blue color. It is found in the Tsumeb mine in Namibia and named after Andrew C. Roberts (b. 1950), mineralogist with the Geological Survey of Canada. A Ca-rich analogue (with Ca instead of Cd) is called calcioandyrobertsite and has a more greenish tint.