The crystal structures of four betalomonosovite samples from peralkaline pegmatites of the Khibiny alkaline complex, Kola Peninsula, Russia, were studied using single-crystal X-ray diffraction. The samples represent different chemical and structural varieties of betalomonosovite. The suggested general formula of betalomonosovite, based on the empirical data known to date, is Na5 + xTi4[Si2O7]2[PO3(OH)]2 − y[PO2(OH)2]yO2[(OH,F)2 − zOz], where 0 ≤ x ≤ 2, 0 ≤ y ≤ 1 and 0 ≤ z ≤ 1. Betalomonosovite is a transformation product of lomonosovite, Na10Ti4(Si2O7)2(PO4)2O4, due to the leaching of Na and protonation of O atoms of phosphate groups and Ti–O–Ti bridges. Distinctive features of betalomonosovite are: (a) the presence of H+ in the form of species-defining acid phosphate anion(s) [PO2(OH)2] ± [PO3(OH)]; (b) the presence of OH- anion at the Ti–O–Ti bridges in the O sheet of the HOH block and c) deficiency of Na (as compared to lomonosovite) in an amount related to the degree of protonation. A hypothetical end-member product of lomonosovite alteration with the simplified formula Na4Ti4[Si2O7]2[PO2(OH)2]2O2(OH)2 has not been reported in Nature yet. The ways and the degree of alteration may vary significantly, resulting in significant variations in both crystal structure and chemical composition, including the Na content, the degree of the substitution of O by OH, unit-cell dimensions and splitting of the P, O and/or Na sites.
Skip Nav Destination
Article navigation
Research Article|
March 01, 2018
Betalomonosovite: chemical and structural variability and genesis
Inna S. Lykova;
1
Fersman Mineralogical Museum RAS
, Leninsky Prospekt 18-2, 119071Moscow, Russia
2
Faculty of Geology, Moscow State University
, Vorobievy Gory, 119991Moscow, Russia
Corresponding author, e-mail: innalykova@mail.ru
Search for other works by this author on:
Nikita V. Chukanov;
Nikita V. Chukanov
3
Institute of Problems of Chemical Physics RAS
, Chernogolovka, Moscow Region142432, Russia
Search for other works by this author on:
Igor V. Pekov;
Igor V. Pekov
2
Faculty of Geology, Moscow State University
, Vorobievy Gory, 119991Moscow, Russia
Search for other works by this author on:
Vasiliy O. Yapaskurt;
Vasiliy O. Yapaskurt
2
Faculty of Geology, Moscow State University
, Vorobievy Gory, 119991Moscow, Russia
Search for other works by this author on:
Gerald Giester
Gerald Giester
4
Institute of Mineralogy and Crystallography, University of Vienna
, Althanstrasse 14, 1090 Vienna, Austria
Search for other works by this author on:
European Journal of Mineralogy (2018) 30 (2): 289–304.
Article history
received:
24 Jan 2017
rev-recd:
10 May 2017
accepted:
07 Dec 2017
first online:
14 Aug 2018
Citation
Inna S. Lykova, Nikita V. Chukanov, Igor V. Pekov, Vasiliy O. Yapaskurt, Gerald Giester; Betalomonosovite: chemical and structural variability and genesis. European Journal of Mineralogy 2018;; 30 (2): 289–304. doi: https://doi.org/10.1127/ejm/2018/0030-2719
Download citation file:
You could not be signed in. Please check your email address / username and password and try again.
Index Terms/Descriptors
- alkali metals
- alteration
- cell dimensions
- chemical composition
- Commonwealth of Independent States
- crystal structure
- EDS spectra
- Europe
- formula
- FTIR spectra
- genesis
- granites
- igneous rocks
- infrared spectra
- Khibiny Mountains
- Kola Peninsula
- leaching
- metals
- Murmansk Russian Federation
- oxygen
- pegmatite
- peralkalic composition
- phosphates
- plutonic rocks
- Russian Federation
- silicates
- sodium
- spectra
- substitution
- transformations
- X-ray diffraction data
- X-ray spectra
- lomonosovite
- betalomonosovite
- heterophyllosilicates
Latitude & Longitude
Citing articles via
Related Articles
D – Goldschmidt Abstracts 2013
Mineralogical Magazine
N – Goldschmidt Abstracts 2013
Mineralogical Magazine
R – Goldschmidt Abstracts 2013
Mineralogical Magazine
V – Goldschmidt Abstracts 2013
Mineralogical Magazine
T – Goldschmidt Abstracts 2013
Mineralogical Magazine
Y – Goldschmidt Abstracts 2013
Mineralogical Magazine
Related Book Content
3. Neoarchean intracontinental areas of sedimentation, magmatism, and high-temperature metamorphism (hot regions) in eastern Fennoscandia
East European Craton: Early Precambrian History and 3D Models of Deep Crustal Structure
Rare Metal Deposits Associated with Alkaline/Peralkaline Igneous Rocks
Rare Earth and Critical Elements in Ore Deposits
10. Late Paleoproterozoic Svecofennian accretionary orogen
East European Craton: Early Precambrian History and 3D Models of Deep Crustal Structure
11. Late Paleoproterozoic late- and postcollisional granitoid and alkaline magmatism
East European Craton: Early Precambrian History and 3D Models of Deep Crustal Structure
Source region of a granite batholith: evidence from lower crustal xenoliths and inherited accessory minerals
The Second Hutton Symposium on the Origin of Granites and Related Rocks
Internal differentiation of rare-element pegmatites; A synthesis of recent research
Ore-bearing Granite Systems; Petrogenesis and Mineralizing Processes