We would like to thank Prof. R.D. Schuiling from the University of Utrecht and Prof. D. Heymann from the Rice University for providing the olivine sample and the piece of Allende meteorite, respectively. Furthermore, we are grateful to several people of the Free University, particularly, J. Bouma for technical support, M. Konert for measuring the size distributions of the samples, S. Kars for providing SEM photographs and L. IJlst for helping us crushing and sieving the olivine sample. We also like to thank Dr. M. Cabrerizo from the Dep. of Applied Physics at the University of Granada for fruitful discussions. This work was performed under an ESA external fellowship at the Dep. of Physics and Astronomy, Free University, Amsterdam.
© European Southern Observatory (ESO) 2000
Online publication: August 17, 2000