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Abstract
Five calderite-andradite garnets from Otjosondu, Namibia, were studied chemically and by optical absorption and Mössbauer spectroscopy. The combined results of chemical analyses and Mössbauer and optical absorption spectroscopy make small amounts of octahedral Mn3+ likely, corresponding to up to 4.8 mol% of the blythite endmember, Mn32+Mn23+Si3O12.
Published Online: 2010-08-25
Published in Print: 1989
