gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1994.058.393.20 Short Communications Causes of the Purple and Pink Colours of Manganoan Sugilites from the Wessels Mine, South Africa Fritsch Emmanuel Shigley James E. GIA Research, Gemological Institute of America, 1660 Stewart Street, Santa Monica, California 90404-4088, USA 12 1994 58 393 681 685 29 3 1994 18 5 1994 Copyright © 1994, The Mineralogical Society 1994 sugilite manganese colour Wessels mine South Africa