Proshchenkoite-(Y) from Russia - a new mineral species in the vicanite group: descriptive data and crystal structure
(2008) In Mineralogical Magazine 72(5). p.1071-1082- Abstract
- A REE-bearing fluorosilicate from the Tommot REE-Nb deposit in Yakutia, Russia, described without a name in 1966, is characterized here as a new species, proshchenkoite-(Y), of the vicanite group of borosilicates. Wavelength-dispersive electron probe analyses gave the following empirical formula: (Y3.70REE7.54Ca1.55Na1.16Mn0.77Th0.10Pb0.01)(Sigma 14.83)(Fe0.832+M0.15Ti0.02)(Sigma 1.00)Ca-1.00 (P0.70Si0.26As0.04)(Sigma 1.00)Si6.05B3.20(O34.55F13.45)(Sigma 48). Boron was analysed with a nuclear microprobe method based on the nuclear reaction B-11(p,alpha)2 alpha. The simplified formula is (Y,REE,Ca,Na,Mn)(15) (Fe2+,Mn)Ca(P,Si)Si6B3O34F14. The mineral is trigonal, R3m, with a = 10.7527(7) angstrom, c = 27.4002(18) angstrom, V = 2743.6(6)... (More)
- A REE-bearing fluorosilicate from the Tommot REE-Nb deposit in Yakutia, Russia, described without a name in 1966, is characterized here as a new species, proshchenkoite-(Y), of the vicanite group of borosilicates. Wavelength-dispersive electron probe analyses gave the following empirical formula: (Y3.70REE7.54Ca1.55Na1.16Mn0.77Th0.10Pb0.01)(Sigma 14.83)(Fe0.832+M0.15Ti0.02)(Sigma 1.00)Ca-1.00 (P0.70Si0.26As0.04)(Sigma 1.00)Si6.05B3.20(O34.55F13.45)(Sigma 48). Boron was analysed with a nuclear microprobe method based on the nuclear reaction B-11(p,alpha)2 alpha. The simplified formula is (Y,REE,Ca,Na,Mn)(15) (Fe2+,Mn)Ca(P,Si)Si6B3O34F14. The mineral is trigonal, R3m, with a = 10.7527(7) angstrom, c = 27.4002(18) angstrom, V = 2743.6(6) angstrom(3), Z = 3. The crystal structure was refined to R1 = 0.042 for 1819 observed reflections. Proshchenkoite-(Y) is isostructural with okanoganite-(Y), vicanite-(Ce) and hundholmenite-(Y), and the differences in site occupancies are discussed. The strongest six reflections of the X-ray powder-diffraction pattern [d(obs) in angstrom, (I), (hkl)] are: 4,441, (36), (202); 3.144, (77), (214); 3.028, (45), (009); 2.968, (100), (027); 1.782, (32), (330); and 1.713, (32), (1.2.14). The mineral is optically uniaxial (-) with omega 1.734(2) and epsilon 1.728(2). The Mohs hardness is about 5; density measured on material subject to incipient metarnictization is 4.72 g/cm(3), as compared to D-calc = 4.955 g/cm(3). The result of electron microprobe analyses of alleged okanoganite-(Y) from the type locality in Okanogan County, Washington, USA, is also presented. We find here also that P > Si at one of the sites, whereas the analytical data of Boiocchi et al. (2004) indicate Si > P. Consequently, the mineral we have analysed is the P analogue of okanoganite-(Y), another new species. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1399273
- author
- Raade, G. ; Grice, J. D. ; Erambert, M. ; Kristiansson, Per LU and Witzke, T.
- organization
- publishing date
- 2008
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- nuclear microprobe, electron-microprobe data, REE borosilicate, group, vicanite, okanoganite-(Y), proshchenkoite-(Y), new mineral species, data, crystal structure, Tommot REE-Nb deposit, Russia
- in
- Mineralogical Magazine
- volume
- 72
- issue
- 5
- pages
- 1071 - 1082
- publisher
- Mineralogical Society of Great Britain and Ireland
- external identifiers
-
- wos:000265132100007
- scopus:64549159416
- ISSN
- 0026-461X
- DOI
- 10.1180/minmag.2008.072.5.1071
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Nuclear Physics (Faculty of Technology) (011013007)
- id
- 6d114601-ef64-42c8-bb61-c7471198bc13 (old id 1399273)
- date added to LUP
- 2016-04-01 11:39:41
- date last changed
- 2022-01-26 08:22:25
@article{6d114601-ef64-42c8-bb61-c7471198bc13,
abstract = {{A REE-bearing fluorosilicate from the Tommot REE-Nb deposit in Yakutia, Russia, described without a name in 1966, is characterized here as a new species, proshchenkoite-(Y), of the vicanite group of borosilicates. Wavelength-dispersive electron probe analyses gave the following empirical formula: (Y3.70REE7.54Ca1.55Na1.16Mn0.77Th0.10Pb0.01)(Sigma 14.83)(Fe0.832+M0.15Ti0.02)(Sigma 1.00)Ca-1.00 (P0.70Si0.26As0.04)(Sigma 1.00)Si6.05B3.20(O34.55F13.45)(Sigma 48). Boron was analysed with a nuclear microprobe method based on the nuclear reaction B-11(p,alpha)2 alpha. The simplified formula is (Y,REE,Ca,Na,Mn)(15) (Fe2+,Mn)Ca(P,Si)Si6B3O34F14. The mineral is trigonal, R3m, with a = 10.7527(7) angstrom, c = 27.4002(18) angstrom, V = 2743.6(6) angstrom(3), Z = 3. The crystal structure was refined to R1 = 0.042 for 1819 observed reflections. Proshchenkoite-(Y) is isostructural with okanoganite-(Y), vicanite-(Ce) and hundholmenite-(Y), and the differences in site occupancies are discussed. The strongest six reflections of the X-ray powder-diffraction pattern [d(obs) in angstrom, (I), (hkl)] are: 4,441, (36), (202); 3.144, (77), (214); 3.028, (45), (009); 2.968, (100), (027); 1.782, (32), (330); and 1.713, (32), (1.2.14). The mineral is optically uniaxial (-) with omega 1.734(2) and epsilon 1.728(2). The Mohs hardness is about 5; density measured on material subject to incipient metarnictization is 4.72 g/cm(3), as compared to D-calc = 4.955 g/cm(3). The result of electron microprobe analyses of alleged okanoganite-(Y) from the type locality in Okanogan County, Washington, USA, is also presented. We find here also that P > Si at one of the sites, whereas the analytical data of Boiocchi et al. (2004) indicate Si > P. Consequently, the mineral we have analysed is the P analogue of okanoganite-(Y), another new species.}},
author = {{Raade, G. and Grice, J. D. and Erambert, M. and Kristiansson, Per and Witzke, T.}},
issn = {{0026-461X}},
keywords = {{nuclear microprobe; electron-microprobe data; REE borosilicate; group; vicanite; okanoganite-(Y); proshchenkoite-(Y); new mineral species; data; crystal structure; Tommot REE-Nb deposit; Russia}},
language = {{eng}},
number = {{5}},
pages = {{1071--1082}},
publisher = {{Mineralogical Society of Great Britain and Ireland}},
series = {{Mineralogical Magazine}},
title = {{Proshchenkoite-(Y) from Russia - a new mineral species in the vicanite group: descriptive data and crystal structure}},
url = {{http://dx.doi.org/10.1180/minmag.2008.072.5.1071}},
doi = {{10.1180/minmag.2008.072.5.1071}},
volume = {{72}},
year = {{2008}},
}