Sophiite: Semenova T F, Rozhdestvenskaya I V, Filatov S K, Vergasova L P: Mineralogical Magazine 56 (1992) 241-245: Crystal structure and physical properties of sophiite, Zn2(SeO3)Cl2, a ...
These cones display a unique fumarolic activity and are type locality for many famous Tolbachik fumarol minerals like Pyipite, Sophiite, Tolbachite etc etc.