Single-crystal X-ray diffraction, EMPA, FTIR and X-ray photoelectron spectroscopy study of narsarsukite from Murun Massif, Russia

被引：5
|
作者：
Schingaro, E. [1 ]
Mesto, E. [1 ]
Lacalamita, M. [1 ]
Scordari, F. [1 ]
Kaneva, E. [2 ]
Vladykin, F. N. [2 ]
机构：
[1] Univ Bari Aldo Moro, Dipartimento Sci Terra & Geoambientali, Via E Orabona 4, I-70125 Bari, Italy
[2] Russian Acad Sci, Siberian Branch, Inst Geochem, Irkutsk 664033 33, Russia
来源：
MINERALOGICAL MAGAZINE | 2017年 / 81卷 / 02期
关键词：
narsarsukite; iron speciation; disorder modelling; crystal chemistry; KHAN BOGDO MONGOLIA; STRUCTURE REFINEMENT; CHEMISTRY; LABUNTSOVITE; COMPLEX; QUEBEC; FE; TI;
D O I：
10.1180/minmag.2016.080.135
中图分类号：
P57 [矿物学];
学科分类号：
070901 ;
摘要：
A crystal chemical study of narsarsukite from the Murun alkaline massif, Russia has been carried out combining single-crystal X-ray diffraction, electron microprobe analyses, micro-Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The narsarsukite single crystals are tetragonal (space group 14Im) with unit-cell parameters: 10.7140(1) <= a <= 10.7183(2) angstrom and 7.9478(1) <= c <= 7.9511(1) angstrom. The XPS analysis showed that Fe occurs in the mineral as Fe3+, whereas the FTIR spectrum showed that the sample studied is anhydrous. The average crystal chemical formula of the Marian narsarsukite is: Na2.04K0.01(V0.015+Ti0.74Zr0.01Al0.01Fe0.223+Mg0.01)(1.00) Structural disorder at octahedral and interstitial sites was modelled and also discussed in consideration of the main substitutional mechanism Ti4++ O2- <-> Fe3+ + (F-, OH-) active in the structure of the mineral.
引用
收藏
页码：339 / 354
页数：16
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