The shape and composition of interstellar silicate grains M. Min, L. B. F. M. Waters, A. de Koter, J. W. Hovenier, L. P. Keller and F. Markwick-Kemper A&A, 462 2 (2007) 667-676 Published online: 13 November 2006 DOI: 10.1051/0004-6361:20065436