Gypsum

Gypsum, Talnakh, Siberia

Typical selenite variaty of Gypsum occuring in Kungur, near Perm.

These are some results from the joint effort to investigate 
the burning coal dumps of the Maysyaka mine, eastern Donbas.
Sergey retrieved the specimen and with effords of Glenn Stracher we 
got a reasonable confident ID of this crust as being Gypsum with possible Illite. 
(EDX analyses only)
[photo/collection: Maurice de Graaf]
[SEM image John Kevin McCormack via Glenn Stracher]