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Prismatine And Ferrohogbomite-2n2s In Granulite-Facies Fe-Oxide Lenses In The Eastern Ghats Belt At Venugopalapuram, Vizianagaram District, Andhra Pradesh, India: Do Such Lenses Have A Tourmaline-Enriched Lateritic Precursor?, Edward S. Grew, A. T. Rao, K.K. V.S. Raju, C. Hejny, J. M. Moore, D. J. Waters, Martin G. Yates, C. K. Shearer
Prismatine And Ferrohogbomite-2n2s In Granulite-Facies Fe-Oxide Lenses In The Eastern Ghats Belt At Venugopalapuram, Vizianagaram District, Andhra Pradesh, India: Do Such Lenses Have A Tourmaline-Enriched Lateritic Precursor?, Edward S. Grew, A. T. Rao, K.K. V.S. Raju, C. Hejny, J. M. Moore, D. J. Waters, Martin G. Yates, C. K. Shearer
Earth Science Faculty Scholarship
Fluorine-rich prismatine, (square,Fe,Mg)(Mg,Al,Fe)(5)Al-4(Si,B,Al)(5)O-21(OH,F), with F/(OH+F) = 0.36-0.40 and hercynite are major constituents of a Fe-Al-B-rich lens in ultrahigh-temperature granulite-facies quartz-sillimanite-hypersthene-cordierite gneisses of the Eastern Ghats belt, Andhra Pradesh, India. Hemo-ilmenite. sapphirine, magnetite, biotite and sillimanite are subordinate. Lithium, Be and B are concentrated in prismatine (140 ppm Li, 170 ppm Be, and 2.8-3.0 wt.% B2O3). Another Fe-rich lens is dominantly magnetite, which encloses fine-grained zincian ferrohogbomite-2N2S, (Fe2+ Mg,Zn,Al)(6) (Al,Fe3+,Ti)(16)O-30(OH)(2), containing minor Ga2O3 (0.30-0.92 wt.%). Fe-Al-B-rich lenses with prismatine (or kornerupine) constitute a distinctive type of B-enrichment in granulite-facies rocks and have been reported from four other localities worldwide. A scenario …
Werdingite From The Urungwe District, Zimbabwe, Edward S. Grew, Martin G. Yates, Charles K. Shearer, Michael Wiedenbeck
Werdingite From The Urungwe District, Zimbabwe, Edward S. Grew, Martin G. Yates, Charles K. Shearer, Michael Wiedenbeck
Earth Science Faculty Scholarship
Electron and ion microprobe data on two samples of welshite from the type locality of Langban, Sweden, gave analytical totals of 99.38-99.57 wt.% and BeO contents of 4.82-5.11 wt.%, corresponding to 1.692-1.773 Be/20 O. Mossbauer and optical spectra of on
Prismatine: Revalidation For Boron-Rich Compositions In The Kornerupine Group, Edward S. Grew, Mark A. Cooper, Frank C. Hawthorne
Prismatine: Revalidation For Boron-Rich Compositions In The Kornerupine Group, Edward S. Grew, Mark A. Cooper, Frank C. Hawthorne
Earth Science Faculty Scholarship
Kornerupine and prismatine were introduced independently by Lorenzen in 1884 (but published in 1886 and 1893) and by Sauer in 1886, respectively. Ussing (1889) showed that the two minerals were sufficiently close crystallographically and chemically to be regarded as one species. However, recent analyses of boron using the ion microprobe and crystal structure refinement, indicate that the boron content of one tetrahedral site in kornerupine ranges from 0 to 1. Kornerupine and prismatine, from their respective type localities of Fiskenaesset, Greenland and Waldheim, Germany, are distinct minerals, members of an isomorphic series differing in boron content. For this reason, we …