Devilline from Slovakia, Banská Bystrica Region, Špania Dolina

Rich specimen with bluish-green rosettes of devilline (herrengrundite, urvölgyite) from the famous historic (1879-1880) find at the Špania Dolina (formerly Herrengrund, Urvölgy) copper deposit in Slovakia. Size of specimen is 6 x 4 cm. My collection. Photographed by László Kupi/Fine mineral photography.