Gerry Clarke, is a Mine Geologist and Applied Mineralogist and former lecturer in Applied Mineralogy at the University of Plymouth, UK. He is a former Editor for the Industrial Minerals, and an Executive Director of Metal Bulletin. Mr Clarke has written extensively across the spectrum of industrial minerals, and organised and chaired many conferences on behalf of Industrial Minerals Magazine and made numerous presentations to others' events over the years. Mr Clarke is also the compiler and publisher of the Magnesia Availability Wall Map and, in partnership with P W Harben, Inc., the creator of the Magnesia Availability Wall Map.