1-20 OF 339 RESULTS FOR

murmanite

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Published: 01 April 2019
Mineralogical Magazine (2019) 83 (2): 199–207.
...Elena Sokolova; Frank C. Hawthorne Abstract The crystal structure of a murmanite-related mineral (MRM) of the murmanite group (seidozerite supergroup), ideally Na 2 CaTi 4 (Si 2 O 7 ) 2 O 4 (H 2 O) 4 , from Mt. Pyalkimpor, the Lovozero alkaline massif, Kola Peninsula, Russia, was refined in space...
FIGURES
Journal Article
Published: 01 August 2015
European Journal of Mineralogy (2015) 27 (5): 669–682.
... is revised to Zn 2 Ti 4− x (Si 2 O 7 ) 2 O 2 (OH,F,O) 2 (H 2 O,OH,□) 4 with x <1. Structure models of Zn-exchanged forms of murmanite after 5 and 24 hour experiments with 1N ZnSO 4 solution at 90 °C have been obtained from single-crystal X-ray diffraction data. The structural formulae are [ B 1] Ca 0.04...
FIGURES | View All (6)
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.
... , and murmanite, ideally Na 4 Ti 4 (Si 2 O 7 ) 2 O 4 (H 2 O) 4 , a = 5.3875(6) Å, b = 7.0579(7) Å, c = 12.176(1) Å, α = 93.511(2)°, β = 107.943(4)°, γ = 90.093(2)°, V = 439.55(2) Å 3 , D calc. = 2.956 g.cm -3 , from the Lovozero alkaline massif, Kola Peninsula, Russia, have been refined in the space group P...
FIGURES | View All (5)
Journal Article
Published: 01 June 2005
The Canadian Mineralogist (2005) 43 (3): 973–987.
...Pèter Nèmeth; Giovanni Ferraris; György Radnóczi; Olga A. Ageeva Abstract Selected-area electron diffraction (SAED) patterns obtained on samples of the heterophyllosilicates epistolite and murmanite from Mt. Malyi Punkaruaiv, Lovozero massif, in the Kola Peninsula of Russia, invariably show...
FIGURES | View All (8)
Journal Article
Published: 01 October 1999
European Journal of Mineralogy (1999) 11 (5): 871–878.
...Anton R. Chakhmouradian; Maria A. Sitnikova Abstract A sill of murmanite-lorenzenite tinguaite is exposed on the northern slope of Mt. Selsurt, Lovozero alkaline complex (Kola Peninsula). The sill emplaced into the differentiated series represents a hypabyssal facies of murmanite lujavrites, one...
Journal Article
Published: 01 June 2004
The Canadian Mineralogist (2004) 42 (3): 797–806.
... structure of murmanite, ideally Na 4 Ti 4 4+ (Si 2 O 7 ) 2 O 4 (H 2 O) 4 , a 5.383(4), b 7.053(4), c 12.170(3) Å, α 93.16(2), β 107.82(2), γ 90.06(2)°, V 439.14 Å 3 , space group P 1, Z = 1, D calc 2.86 g cm −3 , has been considered as a topological analogue of epistolite. It has a TS block...
FIGURES | View All (6)
Journal Article
Published: 28 February 2018
Mineralogical Magazine (2018) 82 (4): 787–807.
...Elena Sokolova; Frank C. Hawthorne ABSTRACT The crystal structure of vigrishinite, ideally NaZnTi 4 (Si 2 O 7 ) 2 O 3 (OH)(H 2 O) 4 , a murmanite-group mineral of the seidozerite supergroup from the type locality, Mt. Malyi Punkaruaiv, Lovozero alkaline massif, Kola Peninsula, Russia, was refined...
FIGURES | View All (13)
Journal Article
Published: 01 February 2010
The Canadian Mineralogist (2010) 48 (1): 41–50.
...-(Ce), murmanite, natrolite, pectolite, rhabdophane-(Ce), steen-strupine-( Ce), tainiolite, tugtupite and vitusite-(Ce). In the Khibiny massif, it is found in a natrolite–microcline vein in foyaite at Mt. Eveslogchorr in association with aegirine, albite, belovite-(La), chivruaiite, epididymite...
FIGURES | View All (5)
Journal Article
Published: 01 May 2018
European Journal of Mineralogy (2018) 30 (3): 525–535.
... of the murmanite group (seidozerite supergroup). It is triclinic, P 1 ‾ , a = 8.673(5), b = 8.694(3), c = 12.21(1) Å, α = 92.70(5), β = 108.46(7), γ = 105.40(4)°, V = 833(1) Å 3 , Z = 2 (from single-crystal diffraction data); a = 8.673(5), b = 8.694(1), c = 12.21(1) Å, α = 92.70(5), β = 108.52(1), γ = 105.42(1...
FIGURES | View All (8)
Image
<span class="search-highlight">Murmanite</span> group: linkage 3 of H and O sheets in <span class="search-highlight">murmanite</span> ( a ), the basic ...
Published: 01 December 2017
Fig. 6. Murmanite group: linkage 3 of H and O sheets in murmanite ( a ), the basic crystal structures of murmanite ( b ) and polyphite ( c ). Legend as in Fig. 3 ; Ti, [6,8] Na, [4] Na polyhedra and Ca-dominant polyhedra are pale yellow, navy blue, turquoise and pale pink, respectively; P
Journal Article
Published: 01 July 2002
European Journal of Mineralogy (2002) 14 (4): 821–836.
...Anton R. CHAKHMOURADIAN; Roger H. MITCHELL Abstract Pyrochlore- and perovskite-group minerals are relatively common accessory constituents of agpaitic murmanite lujavrites at the Lovozero alkaline complex (Russia). These rocks contain euhedral crystals of niobian calcian loparite-(Ce) and, more...
FIGURES | View All (7)
Image
Details of the topology of the H sheet in <span class="search-highlight">murmanite</span> ( a ) and vigrishinite ...
Published: 28 February 2018
Fig. 5. Details of the topology of the H sheet in murmanite ( a ) and vigrishinite ( b ). Legend as in Fig. 2 , Na atoms at the A P site in murmanite are shown as navy blue spheres, Zn octahedra are purple, all linear dimensions are in Å.
Journal Article
Published: 01 October 2011
American Mineralogist (2011) 96 (10): 1624–1629.
..., murmanite, and an ussingite. At Mt. Punkaruaiv, it is found within a ussingite-aegirine-microcline vein as long-prismatic crystals (up to 0.8 mm long) in close association with chabazite-Ca, chkalovite, eudialyte, manganoneptunite, punkaruaivite, rhabdophane-(Ce), sodalite, sphalerite, and steenstrupine-(Ce...
FIGURES
Image
Projection along [100] of the superimposed structures of epistolite and mur...
Published: 01 June 2005
F ig . 6. Projection along [100] of the superimposed structures of epistolite and murmanite (for orientation, see text). The common origin of the reference system is fixed on the Ti atom of the O sheet; this position is not a center of symmetry in murmanite. Colors as in Figure 5 .
Image
Superimposed profiles of X-ray powder patterns of epistolite (black) and mu...
Published: 01 June 2005
F ig . 4. Superimposed profiles of X-ray powder patterns of epistolite (black) and murmanite (red). The positions of the most intense peaks of shkatulkalite (s) and vuonnemite (v), present in the pattern of epistolite, and of “metamurmanite” (mt), present in the pattern of murmanite, are shown.
Image
Perovskite-group minerals from <span class="search-highlight">murmanite</span> lujavrites (BSE images). (a) Pseud...
Published: 01 July 2002
Fig. 7. Perovskite-group minerals from murmanite lujavrites (BSE images). (a) Pseudoporphyritic texture defined by the presence of oikocrysts of murmanite (Mur), lamprophyllite (Lam) and lueshite (white grains indicated by arrows), Mt. Karnasurt; (b) detail of (a), note chadacrysts of aegirine
Journal Article
Published: 19 April 2022
The Canadian Mineralogist (2022) canmin.2100016.
... of shkatulkalite is topologically identical to those in the derivative structures of kazanskyite and nechelyustovite. The structure of the lamprophyllite-group mineral shkatulkalite has a counterpart structure in the murmanite group (Ti = 4 apfu ): kolskyite, ideally Na 2 CaTi 4 (Si 2 O 7 ) 2 O 4 (H 2 O) 7 [ basic...
Image
Variation in P 2 O 5  as a function of SiO 2  in dark brown (lomonosovite) ...
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
Na and Zn contents ( apfu , calculated on the basis of 4 Si+Al) in members ...
Published: 01 August 2015
Fig. 1 Na and Zn contents ( apfu , calculated on the basis of 4 Si+Al) in members of the murmanite–vigrishinite solid-solution series from three peralkaline pegmatites within the Lovozero complex (based on 63 electron microprobe analyses) compared with products of ion-exchange experiments