An Appeal for Reflectance Data on Opaque Minerals for the QDF
B. Cervelle and A. J. Criddle
Secretary IMA/COM, Laboratoire de Minéralogie Cristallographie, T. 16, 4 Place Jussieu, 75230 Paris Cedex 05, France
Department of Mineralogy, British Museum (NH), Cromwell Road, London SW7 5BD, England