What is "vasilseverginite"

Vasilseverginite is a very rare arsenate- sulfate mineral with formula CuO(AsO)(SO). Its structure is of a new type. Is possess a typical feature of many minerals of its type locality, the Tolbachik volcano, namely being a salt with oxide anions. However, it is the first Tolbachik copper oxysalt that is both arsenate and sulfate. Vasilseverginite is monoclinic, with space group P2/n.