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surinamite

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Journal Article
Published: 01 October 2000
American Mineralogist (2000) 85 (10): 1474-1484.
...Sotaro Baba; Edward S. Grew; Charles K. Shearer; John W. Sheraton AbstractThe sapphirine-like mineral surinamite, (Mg,Fe2+)3(Al,Fe3+)3O[AlBeSi3O15], occurs at South Harris as tiny grains enclosed in kyanite or as tabular grains up to 1 mm long mostly surrounded by Si-rich cordierite. A few...
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Journal Article
Published: 01 August 2008
Mineralogical Magazine (2008) 72 (4): 839-876.
...E. S. Grew; U. Hålenius; M. Pasero; J. Barbier AbstractMinerals isostructural with sapphirine-1A, sapphirine-2M, and surinamite are closely related chain silicates that pose nomenclature problems because of the large number of sites and potential constituents, including several (Be, B, As, Sb...
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Journal Article
Published: 01 January 2007
American Mineralogist (2007) 92 (1): 80-90.
... for T6-O16—Tables 4b and 4c). The presence of the highly charged Sb 5+ cation in the M7 site is analogous to that of Ti 4+ cations in the M7 site of other minerals of the aenigmatite-sapphirine-surinamite group, including aenigmatite ( Cannillo et al. 1971 ), rhönite ( Bonaccorsi et al. 1990...
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Journal Article
Published: 01 August 2005
American Mineralogist (2005) 90 (8-9): 1402-1412.
... strongest lines in the powder pattern [d-spacing (Å),(I),(hkl)] are 7.997(57)(100), 4.779(29)(011), 3.120(32)(012), 2.924(69)(01̅3), 2.676(77)( 2̅03), 2.530(100)( 2̅1̅3), 2.410(28)(22̅3), 2.075(39)(41̅1).Of the aenigmatite-sapphirine-surinamite group minerals, makarochkinite is compositionally closest...
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Journal Article
Published: 01 April 2002
American Mineralogist (2002) 87 (4): 501-513.
...Jacques Barbier; Edward S. Grew; Elke Hålenius; Ulf Hålenius; Martin G. Yates AbstractThe crystal structure of surinamite from “Christmas Point,” Enderby Land, Antarctica, has been newly refined by single-crystal X-ray diffraction: VI((Mg2.26Fe2+0.74Fe3+0.39Al2.61)OIV (Al1.00Be1.00Si3.00)O15...
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Journal Article
Published: 01 December 1998
European Journal of Mineralogy (1998) 10 (6): 1283-1293.
...Jacques Barbier AbstractSingle crystals of the sapphirine and surinamite analogues in the MgO - Ga2O 3 - GeO 2 system have been grown from potassium molybdate fluxes. Their crystal structures and cation distributions have been determined by X-ray diffraction. Sapphirine, Mg (sub 8.9) Ga (sub 14.2...
Journal Article
Published: 01 August 1985
American Mineralogist (1985) 70 (7-8): 710-713.
...Emond W. F. de Roever; Stanislav Vrana AbstractThe rare Be–Mg–Al silicate surinamite occurs in biotite–kyanite±garnet pseudomorphs after—apparently beryllian—cordierite in granulites from E Zambia. The surinamite-bearing assemblage was formed by a relatively high-pressure regional metamorphism...
Journal Article
Published: 01 August 1983
American Mineralogist (1983) 68 (7-8): 804-810.
... is unique in the asymmetric unit in that three of its vertices are shared by other tetrahedra.Following along [001] in sapphirine and [100] in surinamite, the thicknesses of octahedra and tetrahedra along the [010] direction are: sapphirinesurinamiteM4⋅4⋅3⋅3⋅3⋅3⋅3⋅2T1⋅1⋅2⋅2⋅1⋅1⋅1⋅2 Copyright © 1983...
Journal Article
Published: 01 October 1981
American Mineralogist (1981) 66 (9-10): 1022-1033.
..., Antarctica. Antarctic surinamite contains 30.9–32.1 wt.% SiO2, 33.7–37.3 wt.% Al2O3, 9.1–13.4 wt.% FeO, 0.01–0.2 wt.% MnO, and 16.4–18.4 wt.% MgO, 0.5–1 wt.% Be, and 0.66±0.2 wt.% H2O. Assuming water is absent, a constant BeO content of 3.5 wt.%, and possible Fe3+ for Al substitution, surinamite analyses...
Journal Article
Published: 01 April 1976
American Mineralogist (1976) 61 (3-4): 193-197.
... blue-green if parallel to the cleavage but very light-colored if perpendicular thereto; formed as minute (<0.2 mm) crystals, tabular on {010}, in a mylonitic spinel-, kyanite-, and sillimanite-bearing mesoperthite gneiss. The surinamite occurs in aggregates with biotite, kyanite, and sillimanite...
Journal Article
Published: 01 February 2004
American Mineralogist (2004) 89 (2-3): 327-338.
... the approximate range T = 700–900 °C, P = 0–2.5 GPa, identify divariant and univariant assemblages containing sapphirine with maximum Be, and determine the sense of variation of maximum Be content with P . At lower T, maximum Be occurs at the low-P limit of surinamite stability, ca. 0.5 GPa. At higher T, maximum...
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Image
Selected chains and ribbons from beryllate structures; ( a ) <b>surinamite</b>; ( ...
Published: 01 August 2014
F ig . 33. Selected chains and ribbons from beryllate structures; ( a ) surinamite; ( b ) sverigeite; ( c ) euclase; ( d ) bearsite; ( e ) fransoletite; ( f ) moraesite. Legend as in Fig. 32 .
Image
Crystal structure of <b>surinamite</b>. Green tetrahedra: Si; yellow tetrahedra: A...
Published: 01 August 2008
F ig . 5. Crystal structure of surinamite. Green tetrahedra: Si; yellow tetrahedra: Al; orange tetrahedra: Be.
Image
Part of the <b>surinamite</b> structure viewed along the [103] direction, nearly p...
Published: 01 April 2002
F igure 2. Part of the surinamite structure viewed along the [103] direction, nearly perpendicular to the ( a-b ) plane. Small number at the corners of the polyhedra refer to the oxygen positions.
Image
Polarized optical absorption spectra of <b>surinamite</b> 12207.
Published: 01 April 2002
F igure 3. Polarized optical absorption spectra of surinamite 12207.
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Fitted Mössbauer spectra of <b>surinamite</b> 12207 at room ( top ) and liquid ni...
Published: 01 April 2002
F igure 5. Fitted Mössbauer spectra of surinamite 12207 at room ( top ) and liquid nitrogen ( bottom ) temperatures. The crosses represent error bars for each data point. The bold solid line shows the sum of the fitted sub-spectra. The thin solid and broken lines represent fitted quadrupole
Image
The crystal structure of <b>surinamite</b>; (a) projected onto (001); note the cha...
Published: 01 January 2002
Figure 11. The crystal structure of surinamite; (a) projected onto (001); note the chains of BeO 4 , AlO 4 341 (dash-shaded) and SiO 4 tetrahedra extending in the a -direction; (b) projected onto (100).
Image
Stability relations of beryl and <b>surinamite</b>. The low temperature stability ...
Published: 01 January 2002
Figure 3. Stability relations of beryl and surinamite. The low temperature stability of beryl with water (dashed line, calculated) and the upper thermal stability of a natural Na-bearing beryl without water (solid line) and the calculated (dashed) line for pure beryl are taken from Barton (1986
Image
Photomicrographs of <b>surinamite</b> in specimen no. 96820-sp1 ( a ) Orthopyroxen...
Published: 01 October 2000
F igure 2. Photomicrographs of surinamite in specimen no. 96820-sp1 ( a ) Orthopyroxene (Opx) and sillimanite (Sil) are enclosed by surinamite (Sur), which was partially replaced by corona of secondary cordierite (Crd); these minerals are surrounded by quartz matrix (Qtz). ( b ) Surinamite
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Compositional plots for <b>surinamite</b>. Sources of data for analyses including ...
Published: 01 October 2000
F igure 3. Compositional plots for surinamite. Sources of data for analyses including a Be determination (Filled symbols): South Harris (this paper); “Christmas Point” ( Grew 1981 and J. Barbier unpublished data). Sources of data for analyses lacking a Be determination (unfilled symbols