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The Canadian Mineralogist; October 2008; v. 46; no. 5; p. 1195-1205; DOI: 10.3749/canmin.46.5.1195
© 2008 Mineralogical Association of Canada
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PSEUDOSINHALITE, MAGNESIOTAAFFEITE-6N' 3S AND MAGNESIOTAAFFEITE-2N' 2S AS REPLACEMENT PRODUCTS OF SPINEL IN DOLOMITE MARBLE FROM STUBENBERG, STYRIA, AUSTRIA

Franz Bernhard1,§, Christoph Hauzenberger1, Franz Walter1 and Roy Kristiansen2

1 Institute of Earth Sciences, Department of Mineralogy and Petrology, Karl-Franzens-University Graz, Universitätsplatz 2, A–8010 Graz, Austria
2 PO Box 32, N-1650 Sellebakk, Norway

§ E-mail adress: bernhard11at{at}yahoo.de

Pseudosinhalite [ideally Mg2Al3O(BO4)2(OH)] and magnesiotaaffeite-6N'3S (ideally BeMg2Al6O12), with rare lamellae of magnesiotaaffeite-2N' 2S (ideally BeMg3Al8O16) occur as replacement products of spinel in geikielite–ilmenite – baddeleyite – zirconolite veins within polymetamorphic dolomite marble at Stubenberg, Styria, Austria. The crystallization sequence of Mg–Al phases is spinel -> pseudosinhalite -> magnesiotaaffeite minerals, and spinel formed after or during the replacement of baddeleyite by zirconolite. Pseudosinhalite contains up to 2.2 wt.% TiO2, 1.4% Cr2O3, and 1.3% FeO, whereas magnesiotaaffeite minerals contain up to 6.6 wt.% ZnO, 2.4% FeO, and 1.8% Cr2O3. The replacement of spinel by a Mg–Al borate and by Mg–Al–Be oxides requires an influx of B and Be, respectively, since no B- or Be-bearing minerals are present in the original assemblage. These elements are likely derived from fluids released from a Permian granite and pegmatites, or from Eo-Alpine metamorphic fluids that have interacted with B- and Be-bearing lithologies.

Keywords: pseudosinhalite, magnesiotaaffeite-6N'3S, magnesiotaaffeite-2N'2S, spinel, geikielite, ilmenite, marble, Eastern Alps, Stubenberg, Austria.






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