Hydrated copper uranyl arsenate of the Autunite group, forming green, fluorescent, micaceous crystals. It's highly radioactive and toxic, associated with potent transformation.
Emerald Green, Grass Green, forms tabular or pyramidal crystals, micaceous, fluoresces
Zeunerite is classified as a arsenate mineral mineral which typically crystallizes in the tetragonal system. Its chemical formula is Cu(UO2)2(AsO4)2·(10-16)H2O. Common crystal habits include crystals flat tabular on {001}, commonly subparallel to micaceous.