scholarly journals On the mineralogy and paragenesis of tugtupite Na8Al2Be2Si8O24(Cl,S)2 from the Ilímaussaq alkaline intrusion, South Greenland

1971 ◽  
Vol 95 ◽  
pp. 3-57
Author(s):  
H Sørensen ◽  
M Danø ◽  
O.V Petersen ◽  
A.S Povarennykh ◽  
A.N Platonov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Kola Peninsula ◽  
Alkaline Intrusion ◽  
Hydrothermal Veins

Tugtupite, Na8Al2Be2Si8O24(Cl,S) 2, is colourless to red, tetragonal, pseudocubic and forms triplet twins on {101}. c: a = 1.0269 ± 0.0003, d = 2.33 g/cm3, nε = 1.499 ± 0.001, nα = 1.495 ± 0.001. a0 = 8.637-8.643, c0 = 8.867 - 8.870, V0 = 662 Å3. The description of the crystal structure is taken from Danø (1966). The mineral occurs in hydrothermal veins in the Ilímaussaq alkaline intrusion, South Greenland, and in the Lovozero alkaline intrusion, Kola Peninsula (beryllosodalite). A number of occurrences of tugtupite in Ilimaussaq are described. Tugtupite is most commonly associated with albite, analcime and Li-mica and is generally secondary after chkalovite. The paragenesis and origin of the mineral and a number of associated beryllium silicates are discussed.

Crystal Structure of Niobium-Rich Lomonosovite with Symmetry P1 from the Khibiny Massif (Kola Peninsula)

2020 ◽  
Vol 65 (3) ◽  
pp. 422-427
Author(s):  
R. K. Rastsvetaeva ◽  
V. A. Zaitsev ◽  
I. V. Pekov
Keyword(s):  
Crystal Structure ◽  
Kola Peninsula ◽  
Khibiny Massif

scholarly journals From structure topology to chemical composition. XXIII. Revision of the crystal structure and chemical formula of zvyaginite, Na2ZnTiNb2(Si2O7)2O2(OH)2(H2O)4, a seidozerite-supergroup mineral from the Lovozero alkaline massif, Kola peninsula, Russia

2017 ◽  
Vol 81 (6) ◽  
pp. 1533-1550 ◽  
Author(s):  
E. Sokolova ◽  
A. Genovese ◽  
A. Falqui ◽  
F.C. Hawthorne ◽  
F. Cámara
Keyword(s):  
Crystal Structure ◽  
Kola Peninsula ◽  
Microprobe Analysis ◽  
Structural Formula ◽  
Chemical Formula ◽  
Titanium Silicate ◽  
Structure Topology ◽  
Diffraction Patterns ◽  
Alkaline Massif ◽  
The Ideal

AbstractThe crystal structure and chemical formula of zvyaginite, ideally Na2ZnTiNb2(Si2O7)2O2(OH)2(H2O)4, a lamprophyllite-group mineral of the seidozerite supergroup from the type locality, Mt. Malyi Punkaruaiv, Lovozero alkaline massif, Kola Peninsula, Russia have been revised. The crystal structurewas refined with a new origin in space group C1, a = 10.769(2), b = 14.276(3), c = 12.101(2) Å, α = 105.45(3), β = 95.17(3), γ = 90.04(3)°, V = 1785.3(3.2) Å3, R1 = 9.23%. The electron-microprobe analysis gave the following empirical formula [calculated on 22 (O + F)]: (Na0.75Ca0.09K0.04□1.12)Σ2 (Na1.12Zn0.88Mn0.17Fe2+0.04□0.79)Σ3 (Nb1.68Ti1.25Al0.07)Σ3 (Si4.03O14)O2 [(OH)1.11F0.89]Σ2(H2O)4, Z = 4. Electron-diffraction patterns have prominent streaking along c* and HRTEM images show an intergrowth of crystalline zvyaginite with two distinct phases, both of which are partially amorphous. The crystal structure of zvyaginite is an array of TS (Titanium-Silicate) blocks connected via hydrogen bonds between H2O groups. The TS block consists of HOH sheets (H = heteropolyhedral, O = octahedral) parallel to (001). In the O sheet, the [6]MO(1,4,5) sites are occupied mainly by Ti, Zn and Na and the [6]MO(2,3) sites are occupied by Na at less than 50%. In the H sheet, the [6]MH(1,2) sites are occupied mainly by Nb and the [8]AP(1) and [8]AP(2) sites are occupied mainly by Na and □. The MH and AP polyhedra and Si2O7 groups constitute the H sheet. The ideal structural formula is Na□Nb2NaZn□Ti(Si2O7)2O2(OH)2(H2O)4. Zvyaginite is a Zn-bearing and Na-poor analogue of epistolite, ideally (Na□)Nb2Na3Ti(Si2O7)2O2(OH)2(H2O)4. Epistolite and zvyaginite are related by the following substitution in the O sheet of the TS-block: (Naþ 2 )epi↔Zn2+ zvy +□zvy. The doubling of the t1 and t2 translations of zvyaginite relative to those of epistolite is due to the order of Zn and Na along a (t1) and b (t2) in the O sheet of zvyaginite.

scholarly journals Beryllium Mineralogy of the Kola Peninsula, Russia—A Review

Minerals ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 12 ◽  
Author(s):  
Lyudmila Lyalina ◽  
Ekaterina Selivanova ◽  
Dmitry Zozulya ◽  
Gregory Ivanyuk
Keyword(s):  
Kola Peninsula ◽  
Mafic Rocks ◽  
Abrupt Changes ◽  
Ore Minerals ◽  
Available Information ◽  
Late Stages ◽  
Felsic Rocks ◽  
Hydrothermal Veins

This paper reviews the available information on the beryllium mineralogy of the different type of occurrences in the Kola Peninsula, northwest Russia. Beryllium mineralization in the region is mainly associated with alkaline and felsic rocks, which differ significantly in petrological, geochemical, mineralogical features and age. In total 28 beryllium minerals are established on the Kola Peninsula up today. Beryl is one of the ore minerals in the differentiated granite pegmatites of the Kolmozerskoe lithium deposit. A large diversity of beryllium minerals occur in the pegmatites and hydrothermal veins formed in the late stages of the Lovozero and Khibiny alkaline massifs. Most of these minerals, as leifite, lovdarite, odintsovite, sphaerobertrandite and tugtupite are rare in other environments and have unique properties. These minerals formed under conditions of extreme alkalinity and their formation was favored by abrupt changes in the alkalinity regimes. Some of minerals, as chrysoberyl in xenoliths of hornfels, genthelvite and unique intergrowth of meliphanite and leucophanite formed in contrasting geochemical fronts between felsic/intermediate and mafic rocks.

Crystal chemistry of natural layered double hydroxides. I. Quintinite-2H-3c from the Kovdor alkaline massif, Kola peninsula, Russia

2010 ◽  
Vol 74 (5) ◽  
pp. 821-832 ◽  
Author(s):  
S. V. Krivovichev ◽  
V. N. Yakovenchuk ◽  
E. S. Zhitova ◽  
A. A. Zolotarev ◽  
Y. A. Pakhomovsky ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Kola Peninsula ◽  
Direct Methods ◽  
Stacking Sequence ◽  
Layer Sequence ◽  
Layer Stacking ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
First Time ◽  
Alkaline Massif

AbstractThe crystal structure of quintinite-2H-3c, [Mg4Al2(OH)12](CO3)(H2O)3, from the Kovdor alkaline massif, Kola peninsula, Russia, was solved by direct methods and refined to an agreement index (R1) of 0.055 for 484 unique reflections with |Fo| ≥ 4σF. The mineral is rhombohedral, R32, a = 5.2745(7), c = 45.36(1) Å. The diffraction pattern of the crystal has strong and sharp Bragg reflections having h–k = 3n and l = 3n and lines of weak superstructure reflections extended parallel to c* and centred at h–k ≠ 3n. The structure contains six layers within the unit cell with the layer stacking sequence of …AC=CA=AC=CA=AC=CA… The Mg and Al atoms are ordered in metal hydroxide layers to form a honeycomb superstructure. The full superstructure is formed by the combination of two-layer stacking sequence and Mg-Al ordering. This is the first time that a long-range superstructure in carbonate-bearing layered double hydroxide (LDH) has been observed. Taking into account Mg-Al ordering, the unique layer sequence can be written as …=Ab1C=Cb1A=Ab2C=Cb2A=Ab3C=Cb3A=… The use of an additional suffix is proposed in order to distinguish between LDH polytypes having the same general stacking sequence but with different c parameters compared with the ‘standard’ polytype. According to this notation, the quintinite studied here can be described as quintinite-2H-3c or quintinite-2H-3c[6R], indicating the real symmetry.

Behoite and mimetite from the Saharjok alkaline intrusion, Kola Peninsula

2010 ◽  
Vol 52 (7) ◽  
pp. 641-645 ◽  
Author(s):  
L. M. Lyalina ◽  
Ye. E. Savchenko ◽  
E. A. Selivanova ◽  
D. R. Zozulya
Keyword(s):  
Kola Peninsula ◽  
Alkaline Intrusion

scholarly journals MEGAKALSILITE, A NEW POLYMORPH OF KAlSiO4 FROM THE KHIBINA ALKALINE MASSIF, KOLA PENINSULA, RUSSIA: MINERAL DESCRIPTION AND CRYSTAL STRUCTURE

2002 ◽  
Vol 40 (3) ◽  
pp. 961-970 ◽  
Author(s):  
A. P. Khomyakov ◽  
G. N. Nechelyustov ◽  
E. Sokolova ◽  
E. Bonaccorsi ◽  
S. Merlino ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Kola Peninsula ◽  
Alkaline Massif

Trigonal variation in the garnet supergroup: the crystal structure of nikmelnikovite, Ca12Fe2+Fe3+3Al3(SiO4)6(OH)20, from Kovdor massif, Kola Peninsula, Russia

2021 ◽  
pp. 1-22
Author(s):  
Sergey V. Krivovichev ◽  
Taras L. Panikorovskii ◽  
Victor N. Yakovenchuk ◽  
Ekaterina A. Selivanova ◽  
Gregory Yu. Ivanyuk
Keyword(s):  
Crystal Structure ◽  
Kola Peninsula
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