Determining the forsterite abundance of the dust around asymptotic giant branch stars B. L. de Vries, M. Min, L. B. F. M. Waters, J. A. D. L. Blommaert and F. Kemper A&A, 516 (2010) A86 Published online: 20 July 2010 DOI: 10.1051/0004-6361/200913588