Professor Bruce Cairncross is head of the geology department at the University of Johannesburg. He has an inherent interest in Southern African mineralogy and geology, and his research efforts are aimed at documenting important geological sites and promoting the preservation of the region's mineralogical heritage. He is the author of four books, The Minerals of South Africa, The Manganese Adventure, The Desmond Sacco Collection - Focus on Southern Africa and the First Field Guide to Gemstones of Southern Africa. He is consulting editor for an American journal, Rocks & Minerals, and is an accom...