1. School of Geographical and Earth Sciences University of Glasgow Glasgow G12 8QQ UK
2. Department of Geoscience University of Nevada Las Vegas Las Vegas Nevada 89154 USA
3. Australian Centre for Microscopy and Microanalysis The University of Sydney New South Wales 2006 Australia
4. Department of Materials University of Oxford Oxford OX1 3PH UK
5. Space Science and Technology Centre, School of Earth and Planetary Sciences Curtin University GPO Box U1987 Western Australia 6845 Perth Australia
6. Department of Earth and Planetary Sciences Western Australia Museum Western Australia 6986 Perth Australia
7. School of GeoSciences University of Edinburgh Edinburgh EH9 3FE UK