gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1987.051.361.14 Short Communication An X-ray Diffraction Investigation of a Marine 10 Å Manganate Ostwald J. Dubrawski J. V. The Broken Hill Proprietary Co. Ltd., Central Research Laboratories, PO Box 188, Wallsend, NSW 2287, Australia 9 1987 51 361 463 466 2 6 1986 13 10 1986 Copyright © 1987, The Mineralogical Society 1987 manganate todorokite phyllomanganate X-ray diffraction Pacific Ocean manganese nodules