ERINITE

Erinite is the name of a microcrystalline mineral formed by the oxidation of arsenical copper ores.  As it contains copper, the mineral is green.  Spinach juice is a good reference colour.  There is nothing remotely blue about erinite.Erinite is not mined at only one location, it is found in Cornwall, England; Alsace, France; Utah, USA;  in the Black Forest, Germany; Greece, Hungary, Italy, Spain and South Africa. Erinite has been known since 1828 when it was described by a German scientist named Haidinger in the Annals of Physics, published in Leipzig.   mindat.org, the website that definitively lists and describes minerals, notes that
"a green synthetic glass is also marketed under the name "erinite".
Fraudulent vendors sell this glass as a "new mineral"."