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lomonosovite

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Journal Article
Published: 01 August 2015
European Journal of Mineralogy (2015) 27 (4): 535–549.
... structures of Ag- and Cu-exchanged forms of lomonosovite and Ag-exchanged form of murmanite were studied by single-crystal X-ray diffraction. The topology of the main structural unit, the HOH block, remains unchanged in cation-exchanged forms as compared to the initial lomonosovite Na 4 Ti 4 (Si 2 O 7 ) 2 O4...
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Journal Article
Published: 01 December 2008
Mineralogical Magazine (2008) 72 (6): 1207–1228.
...F. Cámara; E. Sokolova; F. C. Hawthorne; Y. Abdu Abstract The crystal structures of lomonosovite, ideally Na 10 Ti 4 (Si 2 O 7 ) 2 (PO 4 ) 2 O 4 , a = 5.4170(7) Å, b = 7.1190(9) Å, c = 14.487(2) Å, α = 99.957(3)°, β = 96.711(3)°, γ = 90.360(3)°, V = 546.28(4) Å 3 , D calc. = 3.175 g cm -3...
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Journal Article
Published: 01 December 2001
The Canadian Mineralogist (2001) 39 (6): 1665–1673.
.... This model has been refined by the distance least-squares technique (DLS program) and tested against calculated powder-diffraction and SAED patterns. The structure of bornemanite can be described as a [001] stacking of heterophyllosilicate layers, where lomonosovite and seidozerite contents alternate...
FIGURES
Journal Article
Published: 01 October 1998
The Canadian Mineralogist (1998) 36 (5): 1311–1320.
Journal Article
Published: 08 December 2015
The Canadian Mineralogist (2015) 53 (3): 401–428.
... of Na polyhedra and P tetrahedra which ideally gives {Na 2 □ 4 [PO 3 (OH)][PO 2 (OH) 2 ]} pfu . Betalomonosovite is an Na-poor OH-bearing analogue of lomonosovite, Na 10 Ti 4 (Si 2 O 7 ) 2 (PO 4 ) 2 O 4 . In the betalomonosovite structure, there is less Na in the I block and in the TS block when...
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Journal Article
Published: 01 March 2018
European Journal of Mineralogy (2018) 30 (2): 289–304.
.... Betalomonosovite is a transformation product of lomonosovite, Na 10 Ti 4 (Si 2 O 7 ) 2 (PO 4 ) 2 O 4 , due to the leaching of Na and protonation of O atoms of phosphate groups and Ti–O–Ti bridges. Distinctive features of betalomonosovite are: (a) the presence of H + in the form of species-defining acid phosphate...
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Journal Article
Published: 01 April 2010
The Canadian Mineralogist (2010) 48 (2): 279–290.
... Peninsula, Russia. The mineral occurs as equant (100) platy and [001] elongate prismatic crystals up to 0.5–1 mm and aggregates up to 2–3 mm sporadically scattered in a pegmatite matrix. Associated minerals are sodalite, aegirine, arfvedsonite, pectolite, shcherbakovite, lamprophyllite, lomonosovite...
FIGURES
Journal Article
Published: 01 April 2010
The Canadian Mineralogist (2010) 48 (2): 291–300.
...), fluorcaphite, belovite-(Ce), umbite, lemmleinite-K, lomonosovite, lovozerite, phlogopite, sphalerite and galena. The mineral was found in only one hand specimen of pegmatite as a corroded irregularly shaped grain about 3 mm across, intergrown with sodalite, megakalsilite and natrite. It is transparent...
FIGURES
Journal Article
Published: 01 June 2005
The Canadian Mineralogist (2005) 43 (3): 965–972.
.... It is associated with belovite-(Ce), villiaumite, aegirine, ussingite, natrosilite, microcline, sodalite, potassicarfvedsonite, sérandite, nordite-(Ce), ferronordite-(Ce), bornemanite, vuonnemite, lomonosovite, vitusite-(Ce), phosinaite-(Ce), barytolamprophyllite, mangan-neptunite, manaksite, chkalovite...
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Journal Article
Published: 01 June 2002
The Canadian Mineralogist (2002) 40 (3): 961–970.
..., belovite, umbite, lemmleinite-K, lomonosovite, lovozerite, phlogopite, sphalerite, and galena. The mineral was found in only one hand specimen of pegmatite rock as a corroded, irregularly shaped grain 2 × 3 mm across, intergrown with cancrinite, sodalite, and natrite. It is transparent, colorless...
FIGURES
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IR spectra of <b>lomonosovite</b> (a) and betalomonosovite (b) in sample Rsv0259_0...
Published: 01 March 2018
Fig. 2 IR spectra of lomonosovite (a) and betalomonosovite (b) in sample Rsv0259_0260. The spectra are offset for comparison.
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Phosphate groups in the structures of <b>lomonosovite</b> (a), after  Cámara  et a...
Published: 01 March 2018
Fig. 5 Phosphate groups in the structures of lomonosovite (a), after Cámara et al. , 2008 , and betalomonosovite samples ST4992 (b), GIM6019 (c), OlR0194 (d) and Ko0151 (e) as compared to data reported by Rastsvetaeva et al. , 1975 (f), Rastsvetaeva, 1986 (g), Khalilov, 1990 (h
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FTIR spectra of <b>lomonosovite</b> (holotype): (a) KBr-pellet and (b) single-crys...
Published: 08 December 2015
F ig . 1. FTIR spectra of lomonosovite (holotype): (a) KBr-pellet and (b) single-crystal, and betalomonosovite: (c) KBr-pellet and (d) single-crystal, and the Raman spectrum (100–1200 cm –1 ) of betalomonosovite (e).
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TEM characterization of <b>lomonosovite</b>. (a) [100] HRTEM projection of a typic...
Published: 08 December 2015
F ig . 4. TEM characterization of lomonosovite. (a) [100] HRTEM projection of a typical defect-bearing region showing two main lamellae characterized by different projected crystal potential and separated by semicoherent contact interfaces. The panel on the right displays details (with square
Image
Product of the reaction of <b>lomonosovite</b> with 1N AgNO 3  solution at 150°C d...
Published: 01 August 2015
Fig. 1. Product of the reaction of lomonosovite with 1N AgNO 3 solution at 150°C during three days. Bright areas correspond to the Ag-exchanged form of lomonosovite, dark areas are relics of the initial mineral. Back-scattered electron (BSE) image.
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Products of the reaction of <b>lomonosovite</b> with 1N CuSO 4  solution at 150°C ...
Published: 01 August 2015
Fig. 2. Products of the reaction of lomonosovite with 1N CuSO 4 solution at 150°C during 5 (a) and 28 (b) hours. Bright areas correspond to the Cu-exchanged form of lomonosovite, dark areas (a) are relics of the initial mineral. SEM (BSE) images.
Image
The crystal structure of <b>lomonosovite</b> (a) and its Cu-exchanged form (b) pro...
Published: 01 August 2015
Fig. 5. The crystal structure of lomonosovite (a) and its Cu-exchanged form (b) projected along a. Large-cation sites are shown as circles. The unit cells are outlined
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The crystal structure of the Ag-exchanged form of <b>lomonosovite</b> projected al...
Published: 01 August 2015
Fig. 6. The crystal structure of the Ag-exchanged form of lomonosovite projected along a (a) and c (b). Large-cation sites are shown as circles. The unit cell is outlined.
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IR spectra of <b>lomonosovite</b> (1), the product of its ion exchange with 1N AgN...
Published: 01 August 2015
Fig. 7. IR spectra of lomonosovite (1), the product of its ion exchange with 1N AgNO 3 solution during 72 hours (2) and with 1N CuSO 4 solution during 28 hours (3) at 150°C.
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Product of the reaction of <b>lomonosovite</b> with 1N ZnSO 4  solution at 150 °C ...
Published: 01 August 2015
Fig. 2 Product of the reaction of lomonosovite with 1N ZnSO 4 solution at 150 °C during 5 days. Lighter rim of the grain corresponds to the Zn-exchanged form of lomonosovite, dark core is a relic of the initial mineral. The brightest phase along cleavage fractures is zinc sulfate precipitated