Armbrusterite, K5Na6Mn3+Mn142+[Si9O22]4(OH)10{middle dot}4H2O, a new Mn hydrous heterophyllosilicate from the Khibiny alkaline massif, Kola Peninsula, Russia

2007 ◽  
Vol 92 (2-3) ◽  
pp. 416-423 ◽  
Author(s):  
V. N. Yakovenchuk ◽  
S. V. Krivovichev ◽  
Y. A. Pakhomovsky ◽  
G. Yu. Ivanyuk ◽  
E. A. Selivanova ◽  
...  
Keyword(s):  
Kola Peninsula ◽  
Alkaline Massif ◽  
Khibiny Alkaline Massif

scholarly journals Chirvinskyite, (Na,Ca)13(Fe,Mn,□)2(Ti,Nb)2(Zr,Ti)3-(Si2O7)4(OH,O,F)12, a New Mineral with a Modular Wallpaper Structure, from the Khibiny Alkaline Massif (Kola Peninsula, Russia)

Minerals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 219
Author(s):  
Victor Yakovenchuk ◽  
Yakov Pakhomovsky ◽  
Taras Panikorovskii ◽  
Andrey Zolotarev ◽  
Julia Mikhailova ◽  
...  
Keyword(s):  
Kola Peninsula ◽  
Empirical Formula ◽  
Inorganic Compounds ◽  
Structure Type ◽  
New Mineral ◽  
State University ◽  
Mohs Hardness ◽  
Alkaline Massif ◽  
Khibiny Alkaline Massif ◽  
White Streak

Chirvinskyite, (Na,Ca)13(Fe,Mn,□)2(Ti,Nb)2(Zr,Ti)3(Si2O7)4(OH,O,F)12, is a new wöhlerite–related zirconotitano–sorosilicate. It is triclinic, P1, a = 7.0477(5), b = 9.8725(5), c = 12.2204(9) Å, α = 77.995(5), β = 82.057(6), γ = 89.988(5)°, V = 823.35(9) Å3, Z = 1. The mineral was found in albitized alkaline pegmatites in a foyaite of the Mt. Takhtarvumchorr (Khibiny alkaline massif, Kola Peninsula, Russia, N 67°40’, E 33°33’). Chirvinskyite forms sheaf–like and radiated aggregates (up to 6 mm in diameter) of split fibrous crystals hosted by saccharoidal fluorapatite and albite. The mineral is pale cream in color, with a silky luster and a white streak. The cleavage is not recognized. Mohs hardness is 5. Chirvinskyite is biaxial (–), α 1.670(2), β 1.690(2), γ 1.705(2) (589 nm), 2Vcalc = 80.9°. The calculated and measured densities are 3.41 and 3.07(2) g·cm−3, respectively. The empirical formula based on Si = 8 apfu is (Na9.81Ca3.28K0.01)∑13.10(Fe0.72Mn0.69□0.54Mg0.05)∑2.00 (Ti1.81Nb0.19)∑2.00(Zr2.27Ti0.63)∑2.90(Si2O7)4{(OH)5.94O3.09F2.97}∑12.00. Chirvinskyite belongs to a new structure type of minerals and inorganic compounds and is related to the wöhlerite-group minerals. Its modular “wallpaper” structure consists of disilicate groups Si2O7 and three types of “octahedral walls”. The mineral is named in honor of Petr Nikolaevich Chirvinsky (1880–1955), Russian geologist and petrographer, head of the Petrography Department of the Perm’ State University (1943–1953), for his contributions to mineralogy and petrology, including studies of the Khibiny alkaline massif.

scholarly journals Lobanovite, K2Na(Fe42+Mg2Na)Ti2(Si4O12)2O2(OH)4, a new mineral of the astrophyllite supergroup and its relation to magnesioastrophyllite

2017 ◽  
Vol 81 (1) ◽  
pp. 175-181 ◽  
Author(s):  
Elena Sokolova ◽  
Fernando Cámara ◽  
Frank C. Hawthorne ◽  
Evgeny I. Semenov ◽  
Marco E. Ciriotti
Keyword(s):  
Kola Peninsula ◽  
Structure Refinement ◽  
New Mineral ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
International Mineralogical Association ◽  
Orange Colour ◽  
Alkaline Massif ◽  
Khibiny Alkaline Massif

AbstractLobanovite, K2Na(Fe42+Mg2Na)Ti2(Si4O12)2O2(OH)4, is a new mineral of the astrophyllite supergroup from Mt. Yukspor, the Khibiny alkaline massif, Kola Peninsula Russia. It has been known previously under the following names: monoclinic astrophyllite, magnesium astrophyllite, magnesiumastrophyllite and magnesioastrophyllite but has never been formally proposed and approved as a valid mineral species by the Commission on new Minerals, Nomenclature and Classification of the International Mineralogical Association. It has now been revalidated and named lobanovite after Dr. Konstantin V. Lobanov, a prominent Russian ore geologist who worked in the Kola Peninsula for more than forty years (Nomenclature voting proposal 15-B). Lobanovite has been described from pegmatitic cavities on Mt. Yukspor where it occurs as elongated bladed crystals, up to 0.04 mm wide and 0.2 mm long, with a straw yellow to orange colour. Associated minerals are shcherbakovite, lamprophyllite, delindeite, wadeite, umbite and kostylevite. Lobanovite is biaxial (–) with refractive indices (λ = 589 nm) α = 1.658, βcalc. = 1.687, γ = 1.710; 2Vmeas. = 81.5– 83°. Lobanovite is monoclinic, space group C2/m, a = 5.3327(2), b = 23.1535(9), c = 10.3775(4) Å, β = 99.615(1)°, V = 1263.3 (1) Å 3, Z = 2. The six strongest reflections in the powder X-ray diffraction data [d (Å), I, (hkl)] are: 3.38, 100, (003); 2.548, 90, (063); 10.1, 80, (001); 3.80, 60, (042,131); 3.079, 50, (132,062); 2.763, 90, (1̄71). The chemical composition of lobanovite was determined by electron-microprobe analysis and the empirical formula (K1.97Ba0.01)∑1.98(Na0.65Ca0.14)∑0.79 (Fe3.182+Mg2.02Na1.00Mn0.72)∑6.92(Ti1.99Nb0.06)∑2.05[(Si8.01Al0.06)∑8.07O24]O2(OH)4.03F0.19 was calculated on the basis of 30.2 (O + OH + F) anions, with H2O calculated from structure refinement, Dcalc. = 3.161 g cm–3. In the structure of lobanovite, the main structural unit is the HOH block, which consists of one close-packed O (Octahedral) and two H (Heteropolyhedral) sheets. The M(1–4) octahedra form the O sheet and the T4O12 astrophyllite ribbons and [5]-coordinated Ti-dominant D polyhedra link through common vertices to form the H sheet. The HOH blocks repeat along [001], and K and Na atoms occur at the interstitial A and B sites. The simplified and end-member formulae of lobanovite are K2Na [(Fe2+,Mn)4Mg2Na]Ti2(Si4O12)2O2(OH)4 and K2Na(Fe42+Mg2Na)Ti2(Si4O12)2O2(OH)4, respectively.

scholarly journals Self-Organization of the Khibiny Alkaline Massif (Kola Peninsula, Russia)

10.5772/26151 ◽  
2012 ◽  
Author(s):  
Gregory Ivanyuk ◽  
Victor Yakovenchuk ◽  
Yakov Pakhomovsky ◽  
Natalya Konoplyova ◽  
Andrei Kalashnikov ◽  
...  
Keyword(s):  
Kola Peninsula ◽  
Self Organization ◽  
Alkaline Massif ◽  
Khibiny Alkaline Massif

Crystal structure of hilairite from Khibiny alkaline massif (Kola Peninsula)

2009 ◽  
Vol 428 (1) ◽  
pp. 1051-1053 ◽  
Author(s):  
A. A. Grigorieva ◽  
N. V. Zubkova ◽  
I. V. Pekov ◽  
D. Yu. Pushcharovsky
Keyword(s):  
Crystal Structure ◽  
Kola Peninsula ◽  
Alkaline Massif ◽  
Khibiny Alkaline Massif

Chromium mineralization in the Khibiny alkaline massif (Kola Peninsula, Russia)

2009 ◽  
Vol 64 (4) ◽  
pp. 220-229 ◽  
Author(s):  
O. S. Yakovleva ◽  
I. V. Pekov ◽  
I. A. Bryzgalov
Keyword(s):  
Kola Peninsula ◽  
Alkaline Massif ◽  
Khibiny Alkaline Massif

Nafertisite, Na3Fe2+10Ti2(Si6O17)2O2(OH)6F(H2O)2, from Mt. Kukisvumchorr, Khibiny alkaline massif, Kola peninsula, Russia:

2014 ◽  
Vol 26 (5) ◽  
pp. 689-700 ◽  
Author(s):  
Fernando Cámara ◽  
Elena Sokolova ◽  
Yassir A. Abdu ◽  
Frank C. Hawthorne
Keyword(s):  
Kola Peninsula ◽  
Alkaline Massif ◽  
Khibiny Alkaline Massif

Siudaite, Na8(Mn2+2Na)Ca6Fe3+3Zr3NbSi25O74(OH)2Cl·5H2O: a new eudialyte-group mineral from the Khibiny alkaline massif, Kola Peninsula

2018 ◽  
Vol 45 (8) ◽  
pp. 745-758 ◽  
Author(s):  
Nikita V. Chukanov ◽  
Ramiza K. Rastsvetaeva ◽  
Łukasz Kruszewski ◽  
Sergey M. Aksenov ◽  
Vyacheslav S. Rusakov ◽  
...  
Keyword(s):  
Kola Peninsula ◽  
Eudialyte Group ◽  
Group Mineral ◽  
Alkaline Massif ◽  
Khibiny Alkaline Massif
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