Crystal chemistry of natural Mn3+-bearing calderite-andradite garnets from Otjosondu, SWA/Namibia

Georg Amthauer, Kerstin Katz-Lehnert, Dominique Lattard, Martin Okrusch, Eduard Woermann
1989 Zeitschrift für Kristallographie  
Five calderite-andradite garnets from Otjosondu, Namibia, were studied chemically and by optical absorption and Mossbauer spectroscopy. The combined results of chemical analyses and Mossbauer and optical absorption spectroscopy make small amounts of octahedral Mn3 + likely, corresponding to up to 4.8 mol% of the blythite endmember, Mn~+Mn~+Si3012.
doi:10.1524/zkri.1989.189.1-2.43 fatcat:zlzqguzadretvgp24tudqaem4m