Manganoan Ilvaite from Broken Hill, N.S.W. Ban Ban, Queensland, Australia

I. R. Plimer and P. M. Ashley

University of New South Wales, P.O. Box 334, Broken Hill, N.S.W. 2880
Minerals Department, Esso Australia Ltd., G.P.O. Box 4047, Sydney, N.S.W. 2001

Summary: Manganoan ilvaite forms as an early retrograde metamorphic phase from calcic rhodonite in the polymetamorphosed Pb-Zn sulphide/manganese silicate rocks at Broken Hill and from grossular-andradite in a skarn at Ban Ban. Ilvaite exists as a probable metastable phase into which Mn is apparently strongly partitioned. The manganoan ilvaites analysed contain up to 13·5 % MnO substituting for FeO and this substitution shifts the 020 peak.

Mineralogical Magazine; March 1978 v. 42; no. 321; p. 85-88; DOI: 10.1180/minmag.1978.042.321.11
© 1978, The Mineralogical Society
Mineralogical Society (www.minersoc.org)