Hostname: page-component-7479d7b7d-jwnkl Total loading time: 0 Render date: 2024-07-12T11:50:01.498Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Akselrud, L.G., Crun, Yu.N., Zavalii, P.Yu., Pecharsky, V.K. and Fundamensky, V.S. (1989) CSD - universal program package for single crystal and/or powder srtucture data treatment. XII European Cryst. meeting, Moscow. Collected Abstacts B3, 155.Google Scholar
Chiragov, M.I. and Mamedov, H.S. (1972) Crystal structure of canasite K3Ca5Na3(Si>12O3O)(OH,F)4. U.zap. Azerb. Univer., Ser. geol-geogr. no. 4, 14–9 (in Russian).12O3O)(OH,F)4.+U.zap.+Azerb.+Univer.,+Ser.+geol-geogr.+no.+4,+14–9+(in+Russian).>Google Scholar
Chiragov, M.I., Mamedov, H.S., and Belov, N.V. (1969) On the crystal structure of canasite - Ca5Na4K2(Si12O3O)(OH,F)4. Dokl. Acad. Nauk USSR, 185, 672–4.(in Russian).Google Scholar
Dorfman, M.D., Rogachev, D.Ya., Gorotshenko, Z.I. and Uspenskaya, E.I. (1959) Canasite - a new mineral. Ann. Miner. Mus. AN USSR., 9, 158–66.(in Russian).Google Scholar
Lazebnik, K.A. and Lazebnik, Yu.D. (1981) The rare silicates - miserite, canasite, fedorite in the charoite rocks. In Mineralogy and Geochemistry of the ultrabasic and basic rocks of Yakutia. (Kovalsky, V.V., ed.) Yakutsk, 32–50.(in Russian).Google Scholar
Nikishova, L.V., Lazebnik, K.A., Rozhdestvenskaya, I.V., Dazebnik, Yu.D., and Yemerayanova, N.N. (1992) Triclinic canasite from charoitites of Yakutia. Mineral. Zhurn., 14, no. 1, 71–7 (in Russian).Google Scholar
Nikishova, L.V., Lazebnik, K.A., Rozhdestvenskaya, I.V., Yemel'yanova, N.N. and Lazebnik, Yu.D. (1996) Frankamenite K3Na3Ca5(Si12O3O)F3-(OH) H2O new mineral. Triclinic species of canasite from charoitites. Zap. Vses. Mineral. Obshch., 125, pt 2, 106–8 (in Russian).Google Scholar
Pyatenko, Yu.A. (1972) On a common approach to the analysis of local valency balance in inorganic structures. Crystallographia, 17, 773–9.(in Russian).Google Scholar
Rozhdestvenskaya, I.V., Nikishova, L.V., Bannova, I.I. and Lazebnik, Yu.D. (1988) Canasite: refinement and characteristics of the structure, structural typomorphism. Mineral. Zhurn., 10, no. 4, 31–44 (in Russian).Google Scholar
Scott, J.D. (1976) Crystal structure of miserite a Zoltal type 5-structure. Canad. Mineral., 14, 515–28.Google Scholar
Wolkers, N. and Stewart, D. (1983) An empirical method for correcting diffractometer data for absorption effects. Acta Crystallogr. A39, 158–65.Google Scholar