Crystal system Monoclinic | Formula(repeating unit) Cu9O4(AsO4)2(SO4)2 Space group P21/m | |
Crystal class Prismatic (2/m)(same H-M symbol) Unit cell a = 8.113(4) Åb = 9.918(4) Åc = 11.0225(5) Å; β = 110.86° (approximated) | ||
Vasilseverginite is a very rare arsenate-sulfate mineral with formula Cu9O4(AsO4)2(SO4)2. 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 P21/n.
References
Vasilseverginite Wikipedia(Text) CC BY-SA