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The crystal structure of frankamenite

Published online by Cambridge University Press:  05 July 2018

I. V. Rozhdestvenskaya ,
L. V. Nikishova  and
K. A. Lazebnik
I. V. Rozhdestvenskaya
Affiliation:
St Petersburg University, St Petersburg, 199034, Russia
L. V. Nikishova
Affiliation:
St Petersburg University, St Petersburg, 199034, Russia
K. A. Lazebnik
Affiliation:
Yakutian Institute of Geological Sciences, Siberian Department, Academy of Sciences, Yakutsk, 677891, Russia
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Abstract

Frankamenite, K3Na3Ca5[Si12O30]F3(OH)1H2O, from the Yakutian charoitic rocks, has a triclinic unit cell with the dimensions: a = 10.094(3), b = 12.691(3), c = 7.240(1) Å, α = 90.00(2)°, β = 111.02(2)°, γ = 110.20(2)°, sp.gr. = P1, Z = 1. Its crystal structure has been refined to Raniso= 0.059 (Rw = 0.060) using the intensities of 2563 reflections.

The bases of the structure are zig-zag walls of Ca, Na octahedra joined by infinite octagonal cross-sectioned tubes of SiO4 of the composition (Si12O30). Unlike canasite from the Khibini Mountains, the triclinic cell of frankamenite contains only one silicate tube. The atomic coordinates, interatomic distances and angles are topologically similar to those of canasite. Major differences are observed in the distribution of octahedral cations, which reflect the different anion compositions. Frankamenite exhibits six mixed Ca-Na positions, whereas canasite has only one such position. The H2O molecule is located in the centre of the silicate tube between K+ cations.

Keywords

frankamenitenew mineralcrystal structurecharoitic rocksYakutiaRussia
Type
Mineralogy
Information
Mineralogical Magazine , Volume 60 , Issue 403 , December 1996 , pp. 897 - 905
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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