Chemical Composition and Structural Formula of Manganoan Sugilite from the Wessels Mine, Republic of South Africa
Joseph E. Taggart Jr., Eugene E. Foord and James E. Shigley
U.S. Geological Survey, Denver Federal Center, Denver, Colorado, 80225-0046, USA
GIA Research, Gemological Institute of America, Santa Monica, California 90404-4088, USA
Keywords: manganoan sugilite • Wessels Mine • Republic of South Africa