gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1953.030.221.09 X-ray Investigation of Hillebrandite Heller L. B.A., Ph.D. Birkbeck College Research Laboratory, University of London. 6 1953 30 221 150 154 Copyright © 1953, The Mineralogical Society 1953