1. University of Maryland, 8000 Regents Drive, College Park MD Department of Geology, , 20742 USA
2. Corning Inc , One Riverfront Plaza,14831 Corning NY, USA
3. Scripps Institution of Oceanography , 9500 Gilman Drive, 92093 La Jolla CA, USA
4. University of Ottawa Department of Earth and Environmental Sciences, , K1N 6N5, Ottawa, Ontario, Canada
5. University of Ottawa Department of Earth and Environmental Sciences, , K1N 9A7, Ottawa, Ontario, Canada
6. Finland Geological Survey (GTK) , FIN FI-7021 Kuopio, Finland
7. University of Oulu Oulu Mining School, , 90014 Oulu, Finland