1. Institute of Mineralogy and Petrography, Russian Academy of Science, Novosibirsk, 630090, Russia
2. Dept. of Geology and Geophysics and Minnesota Supercomputer Institute, Univ. Minnesota, Minneapolis, MN 55415‐1227
3. Dept. de Physique et C.E.R.C.A, Univ. de Montreal, Montreal, Quebec H3X 2H9, Canada