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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...
FIGURES | View All (8)
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...
FIGURES | View All (5)
Image
Product of the reaction of <span class="search-highlight">lomonosovite</span> 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.
Image
Products of the reaction of <span class="search-highlight">lomonosovite</span> 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
Variation in P 2 O 5  as a function of SiO 2  in dark brown (<span class="search-highlight">lomonosovite</span>) ...
Published: 01 December 2008
F ig . 2. Variation in P 2 O 5 as a function of SiO 2 in dark brown (lomonosovite) through brown to pink and yellow crystals (murmanite) reported by Gerasimovsky ( 1950 ). The red squares are the ideal chemical compositions for lomonosovite and murmanite end-members from Sokolova ( 2006 ).
Image
Product of the reaction of <span class="search-highlight">lomonosovite</span> 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
Image
IR spectra of <span class="search-highlight">lomonosovite</span> (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 <span class="search-highlight">lomonosovite</span> (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 <span class="search-highlight">lomonosovite</span> (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 <span class="search-highlight">lomonosovite</span>. (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
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The crystal structure of <span class="search-highlight">lomonosovite</span> (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 <span class="search-highlight">lomonosovite</span> 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 <span class="search-highlight">lomonosovite</span> (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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Room-temperature Mössbauer spectra of <span class="search-highlight">lomonosovite</span> ( a ) and murmanite ( b...
Published: 01 December 2008
F ig . 1. Room-temperature Mössbauer spectra of lomonosovite ( a ) and murmanite ( b ) fitted using a Voigt-based quadrupole-splitting-distribution (QSD) method. Solid spectrum in ( a ): Fe 2+ , dashed spectra in ( a ): Fe 3+ .
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The TS block in <span class="search-highlight">lomonosovite</span> and murmanite viewed down [001]: the close-pac...
Published: 01 December 2008
F ig . 3. The TS block in lomonosovite and murmanite viewed down [001]: the close-packed octahedral (O) sheet ( a ); the heteropolyhedral H sheet ( b ); linkage of O and H sheets ( c ). (SiO 4 ) tetrahedra are orange; Ti 4+ -dominant polyhedra are yellow; Na-octahedra are navy blue; [8
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General view of the crystal structure of <span class="search-highlight">lomonosovite</span> ( a ) and murmanite (...
Published: 01 December 2008
F ig . 4. General view of the crystal structure of lomonosovite ( a ) and murmanite ( b ) projected onto (100). Legend as in Fig. 2 , [8]-coordinated Na-polyhedra are navy blue; [4,5]-coordinated Na polyhedra in the I block of lomonosovite are turquoise, H 2 O groups are shown as red spheres