gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1965.035.272.14 Short Communications Thermal Transformation of β-Ferric Oxyhydroxide Chandy K. C. Mineral Physics section, Petrology Division, Geological Survey of India, 29 Chowringhee, Calcutta 12 1965 35 272 666 669 7 7 1965 Copyright © 1965, The Mineralogical Society 1965