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![Back-scattered images taken with FE-SEM of boromullite-sillimanite intergrowths and werdingite. (a) Intimate intergrowth of boromullite and Al2SiO5 (presumably sillimanite) around werdingite enclosed in andalusite. MST1002. (b) Boromullite-sillimanite mixed with cordierite and subordinate hercynite surrounded by werdingite. Sample 2006-MST15. (c) Relict werdingite in sillimanite-boromullite matrix. Sample 95-175D. (d) Relict werdingite in sillimanite-boromullite matrix. Sample 2006-MST1. Abbreviations: And – andalusite, Bmu – boromullite, Crd – cordierite, Hc – hercynite, Ilm – ilmenite, Kfs – K-feldspar, Sil – sillimanite, Tur – tourmaline, Wrd – werdingite.]()
![Boromullite replacement of werdingite in sample 2006-MST22. (a) Photomicrograph of a boromullite atoll in cordierite matrix; a second aggregate consisting of boromullite and/or werdingite in lower left, section 2006-MST22c. Plane polarised light. (b) Photomicrograph of a second boromullite atoll in cordierite matrix, 2006-MST22c (analysis in Table 6). Plane polarised light. (c) Backscattered electron image of atoll in (a). Narrow rims of werdingite are present locally on inside of boromullite atoll. (d) Back-scattered electron image of atoll in (b). Scale bar is 0.1 mm. (e) Photomicrograph of an embayed werdingite prism in section 2006-MST22a. Plane polarised light. (f) Back-scattered electron image of this prism showing boromullite overgrowth. Abbreviations: Bmu – boromul-lite, Crd – cordierite, Hc – hercynite, Ilm – ilmenite, Mnz – monazite, Sil – sillimanite, Wrd – werdingite.]()
![Back-scattered electron images of sillimanite-boromullite intergrowths (a) Intergrowth in a patch of boromullite enclosed in a blocky sillimanite prism. Sample 2006-MST17. (b) Sample 2006-MST3a. (c) Sample 2006-MST3a, second area. (d) Enlargement of a portion of (c). Abbreviations: Bmu – boromullite, Crd – cordierite, Sil – sillimanite.]()
![Holotype boromullite prism in thin section 2006-MST22a. a) Photomicrograph, plane polarised light. b) Back-scattered electron image. Abbreviations: Bmu – boromullite, Crd – cordierite, Hc – hercynite, Kfs – K-feldspar, Sil – sillimanite.]()
![Photomicrograph of two blocky sillimanite aggregates with abundant hercynite; one has partial overgrowth of boromullite. Thin section 2006-MST22a, plane polarised light. Abbreviations: Bmu –boromullite, Crd – cordierite, Hc – hercynite, Sil – sillimanite.]()
![FeO, MgO and SiO2 contents of boromullite measured in 9 samples with the electron microprobe using energy-dispersive spectroscopy (individual analyses). There are fewer points for MgO because this constituent is commonly below the limit of detection. Fe is presumed to be divalent in boromullite.]()
![Back-scattered electron image of werdingite surrounded by successive coronae of hercynite + tourmaline and Al2SiO5+quartz symplectite. Sample 2006-MST33. Abbreviations: Bmu – boromullite, Crd – cordierite, Hc – hercynite (in symplectite), Sil – sillimanite (in symplectite), Tur – tourmaline, Wrd – werdingite, Wrd /Bmu – werdingite partially replaced by boromullite.]()
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![Variation of cell parameters for sillimanite (Bish & Burnham, 1992), boromullite (this paper), and Al5BO9 or Al18B4O33 (Sokolova et al., 1978; Ihara et al., 1980; Garsche et al., 1991). Lines are least squares fits excluding the Ihara et al.(1980) data (open squares) because of the larger reported errors. Cell parameters of sillimanite, Al5BO9 or Al18B4O33 were interchanged or doubled as necessary for direct comparison with boromullite.]()
![Phases related to mullite (circles), including boromullite (bar), together with dumortierite (diamond), plotted in the Al2O3-dominant third, Al2O3-AlBO3-Al2SiO5, of the Al2O3-B2O3-SiO2 (BAS) system. Sources of data: field of “boron-mullites” (dashed lines, Werding and Schreyer 1996); boromullite polysomatic series (Buick et al. 2008); “boron-mullite,” Al16.8B3.6Si3.7O38 (Lührs et al. 2014), LiAl7B4O17 (Åhman et al. 1997), dumortierite end-member (Pieczka et al. 2013); vránaite (this study); other mullite-related phases (Fischer and Schneider 2008; Grew et al. 2008).]()
![Ideal compositions of boromullite (Al9BSi2O19), Al8B2Si2O19, Al5BO9, dumortierite [Al6.8BSi3O17.4(OH)0.6], werdingite [(Fe, Mg)2Al14B4Si4O37], grandidierite [(Fe, Mg)Al3BSiO9], aluminosilicates (Al2SiO5) and cordierite [(Fe, Mg)2Al4Si5O18] plotted in terms of vector components (Fe, Mg)B(AlSiO)-1 and BSi-1O-0.5 added to or subtracted from Al2SiO5 with SiO2 vertical (cf. Grew et al., 1998a, Fig. 8) instead of traditional components (Fe, Mg)O-Al2O3-B2O3-SiO2. Given the overlapping ranges for Mg/(Mg+Fe) ratio for werdingite (0.41–0.50). grandidierite (0.39–0.55) and cordierite (0.38–0.54) in samples containing boromullite from Mount Stafford, we have combined MgO and FeO into a single component, and for simplicity, we refer to the three ferro-magnesian minerals by the names of the Mg end-members. In the presence of quartz, the compositions can be projected onto the (Fe, Mg)B(AlSiO) -1 – BSi-1O-0.5 plane, and Sil + Gdd would be incompatible with Wrd + Crd. Abbreviations: And – andalusite, Bmu – boromullite, Crd – cordierite, Dum – dumortierite, Gdd –grandidierite, Sil – sillimanite, Wrd – werdingite.]()
![Map of the metamorphic zones in the Mount Stafford area (modified from Greenfield et al., 1998; Rubatto et al., 2006) showing location of 14 samples containing boromullite.]()
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![The polysomatic boromullite structure comprises a sillimanite module (Al1, Si2, Al3, Al4, and Si5) and an Al5BO9 module (Al1, Al2, Al4, B5, Al6). O7 is shared by three tetrahedra. Structural drawings were prepared with ATOMS by Shape Software (2006).]()
![Crystal structure projections of boromullite (Buick et al., 2008) parallel c rotated by 4° about a and 4° about b. AlO4 tetrahedra and 5-coordinated Al atoms are blue, SiO4 tetrahedra are green, O is light grey, and B atoms are red. The original unit-cell is transformed with an origin shift of 0, 0, –0.3464 according to b, c, a.]()
![Compositional plot (mole fraction) of boromullite in sample 2006-MST22 (circles), “boron-mullite” synthesised in the presence of melt (triangles) and compositional range for “boron-mullites” inferred by Werding & Schreyer (1996), i.e., the quadrilateral (dashed lines) defined by vertices at 2:1- and 3:2-mullite, Al5BO9, and AlBO3. Least squares fit for sample 2006-MST22 gives Al2O3 = −0.6784*SiO2 + 0.8327, R2 = 0.9702. Following Grew et al. (2008), we have included in the averages only analyses totaling 98–102 wt.% and containing less than 0.5 wt.% MgO and 1.2 wt.% FeO. Atoll refers to texture illustrated in Fig. 7b, d.]()
![Refractive indices of sillimanite (Bloss et al., 1983), boromullite (this study) and Al5BO9 (Scholze, 1956). Uncertainties of ± 0.001 (Scholze, 1956; this paper; Bloss et al., 1983, gave sillimanite indices to 4 significant figures, but did not specify the uncertainties) are smaller than the symbols. Lines are least-squares fits to these data. The crosses are for the “boron-mullites” described by Dietzel & Scholze (1955).]()
![Al2O3and SiO2 contents of boromullite measured in 9 samples with the electron microprobe using energy-dispersive spectroscopy (individual analyses). The least squares regression line passes close to the ideal values for Al9BSi2O19, i.e., 74.22 wt.% Al2O3 (vs. 74.75 wt.% at 19.58 wt.% SiO2) and Al2SiO5, i.e., 62.72 wt.% Al2O3 (vs. 62.92 wt.% at 37.08 wt.% SiO2).]()
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Journal Article
Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite” Available to Purchase
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 October 2008
European Journal of Mineralogy (2008) 20 (5): 935–950.
...Ian S. Buick; Edward S. Grew; Thomas Armbruster; Olaf Medenbach; Martin G. Yates; Gray E. Bebout; Geoffrey L. Clarke Abstract Boromullite is a new mineral corresponding to a 1:1 polysome composed of Al 5 BO 9 and Al 2 SiO 5 modules. Electron-microprobe analysis of the holotype prism is SiO 2 19.01...
FIGURES
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Image
Back-scattered images taken with FE-SEM of boromullite-sillimanite intergro... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 11. Back-scattered images taken with FE-SEM of boromullite-sillimanite intergrowths and werdingite. (a) Intimate intergrowth of boromullite and Al 2 SiO 5 (presumably sillimanite) around werdingite enclosed in andalusite. MST1002. (b) Boromullite-sillimanite mixed with cordierite
Image
Boromullite replacement of werdingite in sample 2006-MST22. (a) Photomicrog... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 7. Boromullite replacement of werdingite in sample 2006-MST22. (a) Photomicrograph of a boromullite atoll in cordierite matrix; a second aggregate consisting of boromullite and/or werdingite in lower left, section 2006-MST22c. Plane polarised light. (b) Photomicrograph of a second
Image
Back-scattered electron images of sillimanite-boromullite intergrowths (a) ... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 12. Back-scattered electron images of sillimanite-boromullite intergrowths (a) Intergrowth in a patch of boromullite enclosed in a blocky sillimanite prism. Sample 2006-MST17. (b) Sample 2006-MST3a. (c) Sample 2006-MST3a, second area. (d) Enlargement of a portion of (c). Abbreviations: Bmu
Image
Holotype boromullite prism in thin section 2006-MST22a. a) Photomicrograph,... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 3. Holotype boromullite prism in thin section 2006-MST22a. a) Photomicrograph, plane polarised light. b) Back-scattered electron image. Abbreviations: Bmu – boromullite, Crd – cordierite, Hc – hercynite, Kfs – K-feldspar, Sil – sillimanite.
Image
Photomicrograph of two blocky sillimanite aggregates with abundant hercynit... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 10. Photomicrograph of two blocky sillimanite aggregates with abundant hercynite; one has partial overgrowth of boromullite. Thin section 2006-MST22a, plane polarised light. Abbreviations: Bmu –boromullite, Crd – cordierite, Hc – hercynite, Sil – sillimanite.
Image
FeO, MgO and SiO 2 contents of boromullite measured in 9 samples with the ... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 5. FeO, MgO and SiO 2 contents of boromullite measured in 9 samples with the electron microprobe using energy-dispersive spectroscopy (individual analyses). There are fewer points for MgO because this constituent is commonly below the limit of detection. Fe is presumed to be divalent
Image
Back-scattered electron image of werdingite surrounded by successive corona... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 13. Back-scattered electron image of werdingite surrounded by successive coronae of hercynite + tourmaline and Al 2 SiO 5 +quartz symplectite. Sample 2006-MST33. Abbreviations: Bmu – boromullite, Crd – cordierite, Hc – hercynite (in symplectite), Sil – sillimanite (in symplectite), Tur
Journal Article
Crystal chemistry of borates and borosilicates with mullite-type structures: a review Available to Purchase
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 October 2008
European Journal of Mineralogy (2008) 20 (5): 917–933.
...′ = 4° (ominelite: γ ′ = 86.0°, mullite: 90°), a range of octahedral tilting angles ω between 61.5° (boromullite) and 90° (for 2:1 mullite it is 59.8°), a range of distances between neighboring chains normalized to the ionic radii of the central atoms between Q r = 8.2 % (PbCrBO 4 ) and 13.8 % (PbMnBO 4...
FIGURES
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Image
Variation of cell parameters for sillimanite ( Bish & Burnham, 1992 ), ... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 8. Variation of cell parameters for sillimanite ( Bish & Burnham, 1992 ), boromullite (this paper), and Al 5 BO 9 or Al 18 B 4 O 33 ( Sokolova et al. , 1978 ; Ihara et al. , 1980 ; Garsche et al. , 1991 ). Lines are least squares fits excluding the Ihara et al. (1980) data
Journal Article
New Mineral Names Available to Purchase
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 April 2009
American Mineralogist (2009) 94 (4): 648–652.
...Paula C. Piilonen; Glenn Poirier; Kimberly T. Tait I.S. Buick, E.S. Grew, T. Armbruster, O. Medenbach, M.G. Yates, G.E. Bebout, and G.L. Clarke (2008) Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue...
Image
Phases related to mullite (circles), including boromullite (bar), together ... Available to Purchase
in Vránaite, ideally Al 16 B 4 Si 4 O 38 , a new mineral related to boralsilite, Al 16 B 6 Si 2 O 37 , from the Manjaka pegmatite, Sahatany Valley, Madagascar
> American Mineralogist
Published: 01 September 2016
Figure 1 Phases related to mullite (circles), including boromullite (bar), together with dumortierite (diamond), plotted in the Al 2 O 3 -dominant third, Al 2 O 3 -AlBO 3 -Al 2 SiO 5 , of the Al 2 O 3 -B 2 O 3 -SiO 2 (BAS) system. Sources of data: field of “boron-mullites” (dashed lines
Image
![Ideal compositions of boromullite (Al9BSi2O19), Al8B2Si2O19, Al5BO9, dumortierite [Al6.8BSi3O17.4(OH)0.6], werdingite [(Fe, Mg)2Al14B4Si4O37], grandidierite [(Fe, Mg)Al3BSiO9], aluminosilicates (Al2SiO5) and cordierite [(Fe, Mg)2Al4Si5O18] plotted in terms of vector components (Fe, Mg)B(AlSiO)-1 and BSi-1O-0.5 added to or subtracted from Al2SiO5 with SiO2 vertical (cf. Grew et al., 1998a, Fig. 8) instead of traditional components (Fe, Mg)O-Al2O3-B2O3-SiO2. Given the overlapping ranges for Mg/(Mg+Fe) ratio for werdingite (0.41–0.50). grandidierite (0.39–0.55) and cordierite (0.38–0.54) in samples containing boromullite from Mount Stafford, we have combined MgO and FeO into a single component, and for simplicity, we refer to the three ferro-magnesian minerals by the names of the Mg end-members. In the presence of quartz, the compositions can be projected onto the (Fe, Mg)B(AlSiO) -1 – BSi-1O-0.5 plane, and Sil + Gdd would be incompatible with Wrd + Crd. Abbreviations: And – andalusite, Bmu – boromullite, Crd – cordierite, Dum – dumortierite, Gdd –grandidierite, Sil – sillimanite, Wrd – werdingite.](https://gsw.silverchair-cdn.com/gsw/Content_public/Journal/eurjmin/20/5/10.1127_0935-1221_2008_0020-1809/6/s_935_fig14_ejm20_5_935_950_buick.jpeg?Expires=2147483647&Signature=vWsGV6d0IgiuWEBivR3FqmRdod~XBeFotp5HrmMTfe~wgifTedAoH2PI4Qn8H1MYmFrzhADZtFaYF5ZttogGAFpfCiDPskDHt80koLbF7BPfEfscXgLJ9N5Vr3BVqoZwOVYOPe1A0pTyRu5KvoRtvTj9uSEiJXPc4aUglNk6u9uKBGFXEqSn9UHgXqYXIKPD7LhUQZXDXsIXLaeOFBQbN3d3CHfgoFQ7zcXqGA5meSg6uLvz2KM5V4O8CTYKZf~2u~IVvhO1AjoU9pnanx5TxqiCggrEP0i5XQR4DAJMYkvrsANFBIvlnJSFLx1MlA23P~-vxHjtYtCu2rpyA8GR8g__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Ideal compositions of boromullite (Al 9 BSi 2 O 19 ), Al 8 B 2 Si 2 O 19 , ... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 14. Ideal compositions of boromullite (Al 9 BSi 2 O 19 ), Al 8 B 2 Si 2 O 19 , Al 5 BO 9 , dumortierite [Al 6.8 BSi 3 O 17.4 (OH) 0.6 ], werdingite [(Fe, Mg) 2 Al 14 B 4 Si 4 O 37 ], grandidierite [(Fe, Mg)Al 3 BSiO 9 ], aluminosilicates (Al 2 SiO 5 ) and cordierite [(Fe, Mg) 2 Al 4 Si 5 O
Image
Map of the metamorphic zones in the Mount Stafford area (modified from Gre... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 9. Map of the metamorphic zones in the Mount Stafford area (modified from Greenfield et al. , 1998 ; Rubatto et al. , 2006 ) showing location of 14 samples containing boromullite.
Journal Article
Vránaite, ideally Al 16 B 4 Si 4 O 38 , a new mineral related to boralsilite, Al 16 B 6 Si 2 O 37 , from the Manjaka pegmatite, Sahatany Valley, Madagascar Available to Purchase
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 September 2016
American Mineralogist (2016) 101 (9): 2108–2117.
...Figure 1 Phases related to mullite (circles), including boromullite (bar), together with dumortierite (diamond), plotted in the Al 2 O 3 -dominant third, Al 2 O 3 -AlBO 3 -Al 2 SiO 5 , of the Al 2 O 3 -B 2 O 3 -SiO 2 (BAS) system. Sources of data: field of “boron-mullites” (dashed lines...
FIGURES
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Image
The polysomatic boromullite structure comprises a sillimanite module (Al1, ... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 2. The polysomatic boromullite structure comprises a sillimanite module (Al1, Si2, Al3, Al4, and Si5) and an Al 5 BO 9 module (Al1, Al2, Al4, B5, Al6). O7 is shared by three tetrahedra. Structural drawings were prepared with ATOMS by Shape Software (2006) .
Image
Crystal structure projections of boromullite ( Buick et al. , 2008 ) paral... Available to Purchase
in Crystal chemistry of borates and borosilicates with mullite-type structures: a review
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 13. Crystal structure projections of boromullite ( Buick et al. , 2008 ) parallel c rotated by 4° about a and 4° about b . AlO 4 tetrahedra and 5-coordinated Al atoms are blue, SiO 4 tetrahedra are green, O is light grey, and B atoms are red. The original unit-cell is transformed
Image
Compositional plot (mole fraction) of boromullite in sample 2006-MST22 (cir... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 1. Compositional plot (mole fraction) of boromullite in sample 2006-MST22 (circles), “boron-mullite” synthesised in the presence of melt (triangles) and compositional range for “boron-mullites” inferred by Werding & Schreyer (1996) , i.e. , the quadrilateral (dashed lines) defined
Image
Refractive indices of sillimanite ( Bloss et al. , 1983 ), boromullite (th... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 4. Refractive indices of sillimanite ( Bloss et al. , 1983 ), boromullite (this study) and Al 5 BO 9 ( Scholze, 1956 ). Uncertainties of ± 0.001 ( Scholze, 1956 ; this paper; Bloss et al. , 1983 , gave sillimanite indices to 4 significant figures, but did not specify the uncertainties
Image
Al 2 O 3 and SiO 2 contents of boromullite measured in 9 samples with the ... Available to Purchase
in Boromullite, Al 9 BSi 2 O 19 , a new mineral from granulite-facies metapelites, Mount Stafford, central Australia: a natural analogue of a synthetic “boron-mullite”
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 6. Al 2 O 3 and SiO 2 contents of boromullite measured in 9 samples with the electron microprobe using energy-dispersive spectroscopy (individual analyses). The least squares regression line passes close to the ideal values for Al 9 BSi 2 O 19 , i.e. , 74.22 wt.% Al 2 O 3 ( vs. 74.75 wt
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