gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1962.033.258.08 Cobaltic Hydroxide in Nature Hey M. H. M.A., D.Se. Dept. of Mineralogy, British Museum (Natural History), London S.W. 7. 9 1962 33 258 253 259 Copyright © 1962, The Mineralogical Society 1962 Summary

Natural cobalt hydroxide is CoO.OH, not Co(OH)2 as has recently been asserted; for this mineral the name heterogenite has priority. Copper, frequently present, may be in solid solution as (Co,Cu)(O,OH)OH, or may be as finely divided malachite; for cuprian heterogenite, the name schulzenite has priority.