Vladimir V.Knauf  Ph.D.:                NATI Research JSC., St.Petersburg

Edward A.Landa Dr. Sci.:               All-Russia Geological Institute, St.Petersburg

Leonid B.Makariev:                        All-Russia Geological Institute, St.Petersburg

With assistance:
M.D.Tolkatchev, M.R.Pavlov - microprobe analyses. Our acknowledgments!