1. John de Laeter Centre, Curtin University Kent. St., Bentley, 6102 Western Australia
2. Department of Earth Sciences University of Geneva Rue des Maraichers 13 CH‐1205 Geneva Switzerland
3. Department of Earth Sciences Università degli Studi di Milano Via Mangiagalli 32, 20133 Milan Italy
4. Department of Geosciences Boise State University 1910 University Drive Boise ID 83725‐1535 USA
5. Adelaide Microscopy The University of Adelaide SA 5005 Adelaide Australia
6. Centre for Microscopy, Characterisation and Analysis The University of Western Australia Perth WA 6009 Australia
7. School of Geosciences University of Edinburgh The King's Building, James Hutton Road EH9 3FE Edinburgh UK
8. Department of Earth and Planetary Sciences McGill University Montreal Quebec H3A 0E8 Canada