gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1985.049.350.15 The Determination of Ferrous and Ferric Iron in Rocks and Minerals—A Comment Gillard R. D. Department of Chemistry, University College, PO Box 78, Cardiff CF1 1XL, Wales, UK 3 1985 49 350 101 102 20 6 1984 28 9 1984 Copyright © 1985, The Mineralogical Society 1985 Abstract

Hey's observation of reduction of ferric ion bound to 1,10-phenanthroline in water is explained in terms of the analogy between quaternization of the ligand and its coordination by iron(III).

 Keywords ferrous ferric iron