Wiktionary
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.