torbernite
Torbernite is a hydrated copper uranyl phosphate mineral with the chemical formula Cu(UO2)2(PO4)2·8–12H2O. It forms as a secondary mineral in oxidized zones of uranium-bearing ore deposits and in hydrothermal veins, often in granitic and pegmatitic environments. Crystals are typically tabular and grow as green to emerald-green plates or prisms; the color can fade with dehydration. It has a vitreous luster and is relatively soft on the Mohs scale, usually around 3. The mineral is radioactive due to its uranium content and should be handled with care.
Torbernite commonly occurs with other uranium minerals such as autunite and meta-autunite and may alter to
The name honors the Swedish chemist Torbern Bergman. Torbernite is of interest to collectors and researchers