...Elena Sokolova; Maxwell C. Day; Frank C. Hawthorne; Fernando Cámara ABSTRACT Selivanovaite, ideally NaFe 3+ Ti 4 (Si 2 O 7 ) 2 O 4 (H 2 O) 4 , is a murmanite-group (seidozerite supergroup) TS-block mineral from the Lovozero massif, Kola Peninsula, Russia. The crystal structure of selivanovaite...

...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...

... 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...

... 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...

... , 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...

...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...

...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...

... 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...

...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...

...-(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...

... 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...

...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...

..., 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...