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boralsilite

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Journal Article
Published: 01 September 2016
American Mineralogist (2016) 101 (9): 2108–2117.
... O 19 , and boralsilite, Al 16 B 6 Si 2 O 37 , as well as synthetic compounds structurally related to mullite. The new mineral vránaite, a third naturally occurring anhydrous ternary BAS phase, is found with albite and K-feldspar as a breakdown product of spodumene in the elbaite-subtype Manjaka...
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Journal Article
Published: 21 September 2015
The Canadian Mineralogist (2015) 53 (2): 357–374.
...Milan Novák; Jan Cempírek; Petr Gadas; Radek Škoda; Michaela Vašinová Galiová; Federico Pezzotta; Lee A. Groat Abstract Boralsilite Al 16 B 6 Si 2 O 37 and Li,Be-bearing “boron mullite” Al 8 B 2 Si 2 O 19 were discovered as breakdown products of spodumene from the elbaite-subtype Manjaka granitic...
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Journal Article
Published: 01 October 2010
American Mineralogist (2010) 95 (10): 1533–1547.
...Jan Cempírek; Milan Novák; Zdeněk Dolníček; Jana Kotková; Radek Škoda Abstract A mineral assemblage involving grandidierite, ominelite, boralsilite, werdingite, dumortierite (locally Sb,Ti-rich), tourmaline, and corundum, along with the matrix minerals K-feldspar, quartz, and plagioclase...
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Journal Article
Published: 01 May 2008
American Mineralogist (2008) 93 (5-6): 918–927.
... and characterized by Rietveld refinements and grid search analyses combined with 11 B and 27 Al MAS NMR spectroscopy. The aluminum borate with a unit-cell composition of Al 32 B 16 O 72 is closely related to the boralsilite (Al 32 B 12 Si 4 O 74 ) structure with Si replaced by B and to mullite (Al 4+2x Si 2−2x O 10...
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Journal Article
Published: 01 February 2008
American Mineralogist (2008) 93 (2-3): 283–299.
...Edward S. Grew; Heribert A. Graetsch; Birgit Pöter; Martin G. Yates; Ian Buick; Heinz-Jürgen Bernhardt; Werner Schreyer; Günter Werding; Christopher J. Carson; Geoffrey L. Clarke Abstract Boralsilite, the only natural anhydrous ternary B 2 O 3 -Al 2 O 3 -SiO 2 (BAS) phase, has been synthesized...
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Journal Article
Published: 01 August 1999
American Mineralogist (1999) 84 (7-8): 1152–1161.
...Donald R. Peacor; Roland C. Rouse; Edward S. Grew Abstract An untwinned sample of boralsilite from the Larsemann Hills, Antarctica was used for measurement of intensity data. Boralsilite, Al 16 B 6 Si 2 O 37 , is monoclinic, space group C2/m, with a = 14.767(1), b = 5.574(1), c = 15.079(1) Aa, beta...
Journal Article
Published: 01 June 1998
American Mineralogist (1998) 83 (5-6): 638–651.
...Edward S. Grew; James J. McGee; Martin G. Yates; Donald R. Peacor; Roland C. Rouse; Joep P. P. Huijsmanns; Charles K. Shearer; Michael Wiedenbeck; Douglas E. Thost; Shu-Chun Su Abstract Boralsilite, the first natural anhydrous Al-B-silicate, is a high-temperature phase in pegmatites cutting...
Journal Article
Published: 01 August 2011
European Journal of Mineralogy (2011) 23 (4): 577–589.
... is not dominant at any site. As we have no data on Fe valence, we cannot determine whether divalent cations are dominant at Mg5A, i.e. , we cannot show that HE138B werdingite is a Fe-dominant analogue of type werdingite. Werdingite in HE138B is intergrown with boralsilite, ideally Al 16 B 6 Si 2 O 37 , also...
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Journal Article
Published: 01 February 2011
The Canadian Mineralogist (2011) 49 (1): 381–405.
... unusually enriched in B-rich phases, including tourmaline (schorl – dravite – foitite solid solutions), prismatine, grandidierite, werdingite, boralsilite and dumortierite. Tourmaline can be used to gain information about the crystallization history of the pegmatites. Six microstructural varieties...
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Image
Crystal structure of vránaite and comparison with <b>boralsilite</b>. The two stru...
Published: 01 September 2016
Figure 2 Crystal structure of vránaite and comparison with boralsilite. The two structures are oriented such that the Si 2 O 7 units (shown in yellow) are parallel. The Al5 (red spheres) and O9 (white spheres) sites are only 20% occupied in vránaite. The B2 site (green triangles
Image
Compositions of <b>boralsilite</b> and vránaite ( Novák et al. 2015 ) projected fr...
Published: 01 September 2016
Figure 5 Compositions of boralsilite and vránaite ( Novák et al. 2015 ) projected from Li 2 O and BeO onto the Al 2 O 3 -AlBO 3 -Al 2 SiO 5 part of the Al 2 O 3 -B 2 O 3 -SiO 2 (BAS) system. The symbols distinguish between B 2 O 3 contents measured with the electron microprobe (black filled
Image
Raman spectrum of vránaite compared to spectra of <b>boralsilite</b> and muscovite...
Published: 01 September 2016
Figure 6 Raman spectrum of vránaite compared to spectra of boralsilite and muscovite.
Image
Plot of Li contents of <b>boralsilite</b> from the Larsemann Hills, Antarctica, an...
Published: 01 September 2016
Figure 7 Plot of Li contents of boralsilite from the Larsemann Hills, Antarctica, and Almgjotheii, Rogaland, Norway (ion microprobe data, Grew et al. 1998 ), for comparison with data on boralsilite and vránaite from Manjaka ( Novák et al. 2015 , Table 2 ; vránaite formulas calculated using ICP
Image
Pressure-temperature diagram for <b>boralsilite</b> crystallization (rectangles) i...
Published: 01 September 2016
Figure 9 Pressure-temperature diagram for boralsilite crystallization (rectangles) in the Larsemann Hills, Antarctica, and Almgjotheii, Norway ( Grew et al. 2008 ), Horní Bory, Czech Republic ( Cempírek et al. 2010 ), and Manjaka, Madagascar ( Novák et al. 2015 ; this paper), and for “boron
Image
BSE images of the assemblage <b>boralsilite</b> + albite + boron mullite. (a) Albi...
Published: 21 September 2015
F ig . 4. BSE images of the assemblage boralsilite + albite + boron mullite. (a) Albite rim around a spodumene crystal with numerous fissures of boralsilite, note late K-feldspar (bright veinlets); (b) inclusion of boralsilite in spodumene; (c) boralsilite associated with K-feldspar, note late K
Image
Compositional data for Manjaka <b>boralsilite</b> and “boron-mullite”. Full square...
Published: 21 September 2015
F ig . 7. Compositional data for Manjaka boralsilite and “boron-mullite”. Full squares indicate ideal compositions. The lines indicate the ideal substitutions.
Image
Backscattered electron images of werdingite (Wrd)-<b>boralsilite</b> (Brs) intergr...
Published: 01 August 2011
Fig. 1. Backscattered electron images of werdingite (Wrd)-boralsilite (Brs) intergrowths in sample HE138A. T – secondary tourmaline, Qz –quartz. Light and dark areas were analyzed separately (Table 5 ).
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Comparison of the structures of <b>boralsilite</b> and werdingite projected down  ...
Published: 01 August 2011
Fig. 7. Comparison of the structures of boralsilite and werdingite projected down b and c , respectively, with an emphasis on the different distribution of Si 2 O 7 units (red). The boralsilite structure is complete, but the werdingite structure is a section (approximately half
Image
Compositional variation of <b>boralsilite</b> (open symbols) and werdingite (fille...
Published: 01 October 2010
F igure 8. Compositional variation of boralsilite (open symbols) and werdingite (filled and cross-filled symbols) in terms of Al, Si, and (Fe+Mg+Mn). White cross-filled symbols represent werdingite analyses where boron was analyzed using EMPA. Gray symbols represent composition of boralsilite
Image
Projection of the crystal structure of <b>boralsilite</b> after  Peacor et al. (19...
Published: 01 May 2008
F igure 5. Projection of the crystal structure of boralsilite after Peacor et al. (1999) . Assignment of atoms and orientation as in Figure 4 .