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labuntsovite group

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Journal Article
Published: 01 June 2007
The Canadian Mineralogist (2007) 45 (3): 529–539.
...Igor V. Pekov; Nikita V. Chukanov; Natalia A. Yamnova; Aleksandr E. Zadov; Peter Tarassoff Abstract Gjerdingenite-Na, (K,Na) 2 Na(Nb,Ti) 4 (Si 4 O 12 ) 2 (OH,O) 4 ·5H 2 O, and gjerdingenite-Ca, K 2 Ca(Nb,Ti) 4 (Si 4 O 12 ) 2 (O,OH) 4 ·6H 2 O, are two new mineral species of the labuntsovite group...
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Journal Article
Published: 01 November 2004
European Journal of Mineralogy (2004) 16 (6): 979–987.
... hardness is about 5; D calc = 2.93 g/cm 3 . The pseudo-orthorhombic crystals are twinned on {001}, elongate along [010] and show the forms {001}, {100}, {201} and {021}. Some general aspects on the formation of labuntsovite-group minerals are discussed. gjerdingenite-Mn new mineral labuntsovite group...
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Journal Article
Published: 01 November 2004
American Mineralogist (2004) 89 (11-12): 1655–1666.
...Thomas Armbruster; Sergey V. Krivovichev; Thomas Weber; Edwin Gnos; Natalia N. Organova; Viktor N. Yakovenchuk; Zoya V. Shlyukova Abstract The average crystal structures of two natural porous titanosilicates of the labuntsovite group, lemmleinite-Ba and lemmleinite-K, ideally Na 4 K 4 Ba 2 Ti 8 (Si...
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Journal Article
Published: 01 December 2002
The Canadian Mineralogist (2002) 40 (6): 1629–1639.
...). The numerous publications by Russian scientists on minerals related to nenadkevichite and labuntsovite and their crystal structures, culminating in the recently approved nomenclature of the labuntsovite group ( Chukanov et al. 2002 ), have been a useful prerequisite for our own investigations...
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Journal Article
Published: 01 January 2002
European Journal of Mineralogy (2002) 14 (1): 165–173.
...Nikita V. CHUKANOV; Igor V. PEKOV; Alexander P. KHOMYAKOV Abstract The present report contains recommendations on the nomenclature of the labuntsovite-group (LG) minerals based on a crystal-structural classification. The labuntsovite group includes hydrous titanium and niobium silicates, both...
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<span class="search-highlight">LABUNTSOVITE</span>-<span class="search-highlight">GROUP</span> MINERALS,  A  2  B  2  C  2  DM  4 [Si 4 O 12 ] 2 (O,OH)...
Published: 01 June 2007
TABLE 1. LABUNTSOVITE-GROUP MINERALS, A 2 B 2 C 2 DM 4 [Si 4 O 12 ] 2 (O,OH) 4 ·4–7H 2 O
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Octahedral-tetrahedral framework in the structures of <span class="search-highlight">labuntsovite</span>-<span class="search-highlight">group</span> mi...
Published: 01 January 2005
Figure 10. Octahedral-tetrahedral framework in the structures of labuntsovite-group minerals (a) and its nodal representation. The labuntsovite 3D net consists of two types of polyhedral units with extended face symbols ( b 2 w 2 b 2 w 2 ) 2 ( b 2 wb 2 w ) 4 ( w 4 ) 2 ( b 2 w ) 4
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Cation-exchanged crystals of <span class="search-highlight">labuntsovite</span>-<span class="search-highlight">group</span> minerals from hydrothermall...
Published: 01 January 2005
Figure 7. Cation-exchanged crystals of labuntsovite-group minerals from hydrothermally altered agpaitic pegmatites. Ba-rich light areas are shown in (a) tsepinite-Na (Mt. Lepkhe-Nelm, Lovozero alkaline complex, Kola Peninsula) and (b) in the rim of tsepinite-Sr (Mt. Eveslogchorr, Khibiny
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Approved species in the <span class="search-highlight">labuntsovite</span> <span class="search-highlight">group</span>,  A  2  B  2  C  2  D [ M  4 (Si...
Published: 01 November 2004
Table 7. Approved species in the labuntsovite group, A 2 B 2 C 2 D [ M 4 (Si 4 O 12 ) 2 (O,OH) 4 ]· n H 2 O.
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The titanosilicate framework of the <span class="search-highlight">labuntsovite</span>-<span class="search-highlight">group</span> minerals, displayed ...
Published: 01 November 2004
F igure 8. The titanosilicate framework of the labuntsovite-group minerals, displayed as in Figure 6 . In addition, the OH sites, occupying 50% of the chain-forming octahedral apices, are marked by squares. The variable arrangement of OH groups leads to different superstructures. In addition
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ROOT NAMES OF MINERALS OF THE <span class="search-highlight">LABUNTSOVITE</span> <span class="search-highlight">GROUP</span>
Published: 01 December 2002
TABLE 7. ROOT NAMES OF MINERALS OF THE LABUNTSOVITE GROUP
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Nomenclature for the minerals of the <span class="search-highlight">labuntsovite</span> <span class="search-highlight">group</span>.
Published: 01 January 2002
Table 2. Nomenclature for the minerals of the labuntsovite group.
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Nomenclature for the minerals of the <span class="search-highlight">labuntsovite</span> <span class="search-highlight">group</span>.
Published: 01 January 2002
Table 2. Nomenclature for the minerals of the labuntsovite group.
Journal Article
Published: 01 March 2007
European Journal of Mineralogy (2007) 19 (2): 217–222.
... for the heteropolyhedral framework (tetrahedral/octahedral) structures of the labuntsovite-group minerals, like systems of channels and disorder. The simpler chemical composition of the synthetic compound, which does not show isomorphous replacements, allows a detailed discussion of the zeolite-like disorder...
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Journal Article
Published: 01 April 2010
The Canadian Mineralogist (2010) 48 (2): 267–278.
...Andrew M. McDonald; George Y. Chao Abstract Rogermitchellite is a new, complex species of zirconosilicate found in igneous breccia at the Poudrette quarry, Mont Saint-Hilaire, Quebec. It is associated with aegirine, annite, galena, a labuntsovite-group mineral, manganoneptunite, microcline...
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Journal Article
Published: 01 June 2006
The Canadian Mineralogist (2006) 44 (3): 775–794.
... theory suggests that network-modifying cations such as Na are present in the vicinity of Nb. This environment most closely resembles those observed in alkali niobosilicates such as vuonnemite and labuntsovite-group minerals. In dry, peraluminous glasses, the sites containing Nb are disordered...
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Journal Article
Published: 01 June 2004
The Canadian Mineralogist (2004) 42 (3): 807–824.
... is such that all anions obey the valence-matching principle. The formulae of batisite, narsarsukite, titanite, the minerals of the labuntsovite group and quartz (Ti-free) are in accord with this general formula. In structures based on chains of edge-sharing (Ti 4+ ϕ 6 ) octahedra, the chains may be simple...
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(001) (top) and (100) (bottom) projections of the mixed frameworks of the l...
Published: 01 January 2005
Figure 6. (001) (top) and (100) (bottom) projections of the mixed frameworks of the labuntsovite-group minerals: nenadkevichite type (a), vuoriyarvite type (b) and labuntsovite type (c).
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Correlation between Ti and Nb contents (calculated per 16 Si atoms) in labu...
Published: 01 January 2005
Figure 7. Correlation between Ti and Nb contents (calculated per 16 Si atoms) in labuntsovite-group minerals. 1 – nenadkevichite subgroup; 2 – labuntsovite and paralabuntsovite subgroups; 3 – lemmleinite subgroup; 4 - kuzmenkoite and organovaite subgroups; 5 – vuoriyarvite subgroup.
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COMPARATIVE DATA FOR NIOBIUM MEMBERS OF THE KUZMENKOITE SUBGROUP OF THE LAB...
Published: 01 June 2007
TABLE 5. COMPARATIVE DATA FOR NIOBIUM MEMBERS OF THE KUZMENKOITE SUBGROUP OF THE LABUNTSOVITE GROUP