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Boromullite, Al9BSi2O19, a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic "boron-mullite"

Buick, Ian; Grew, ES; Armbruster, Thomas; Medenbach, Olaf; Yates, M.G.; Bebout, G.E.; Clarke, G L


Boromullite is a new mineral corresponding to a 1:1 polysome composed of Al5BO9 and Al2SiO5 modules. Electron-microprobe analysis of the holotype prism is SiO2 19.01(l.12), TiO2 0.01(0.02), B2O3 6.52(0.75), Al2O3 74.10(0.95), MgO 0.07(0.03), CaO 0.00(0.02), MnO 0.01(0.04), FeO 0.40(0.08), Sum 100.12 wt.%, which gives Mg0.01 Fe0.03 Al8.88 Si1.93 B1.14 O18.94 (normalised to 12 cations), ideally Al9BSi2O19. Overall, in the type specimen, it ranges in composition from Mg0.01 Fe0.03 Al8.72 Si2.44...[Show more]

CollectionsANU Research Publications
Date published: 2008
Type: Journal article
Source: European Journal of Mineralogy
DOI: 10.1127/0935-1221/2008/0020-1809


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