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The Canadian Mineralogist; June 2005; v. 43; no. 3; p. 973-987; DOI: 10.2113/gscanmin.43.3.973
© 2005 Mineralogical Association of Canada
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Articles

TEM AND X-RAY STUDY OF SYNTACTIC INTERGROWTHS OF EPISTOLITE, MURMANITE AND SHKATULKALITE

Pèter Nèmeth1,*, Giovanni Ferraris1, György Radnóczi2 and Olga A. Ageeva3

1 Dipartimento di Scienze Mineralogiche e Petrologiche, Università di Torino, and Istituto di Geoscienze e Georisorse, CNR, Via Valperga Caluso, 35, I–10125, Torino, Italy
2 Research Institute for Technical Physics and Materials Science, Konkoly Thege Miklós út 29-33, H–1121 Budapest, Hungary
3 Institute of Ore Deposits, Petrography, Mineralogy and Geochemistry, RAS, Staromonetny per., 35, RU–109017 Moscow, Russia

Selected-area electron diffraction (SAED) patterns obtained on samples of the heterophyllosilicates epistolite and murmanite from Mt. Malyi Punkaruaiv, Lovozero massif, in the Kola Peninsula of Russia, invariably show broad, streaked and split diffraction-spots and reveal oriented intergrowths (syntaxy) between the two minerals and of epistolite with minor shkatulkalite (likely a heterophyllosilicate as well). These results are confirmed by X-ray single-crystal and powder-diffraction data. We show that the syntaxy is favored by the presence in epistolite, murmanite and shkatulkalite of common supercells, which leads to a systematic overlap of diffraction spots belonging to different intergrown minerals. The structure determination of epistolite and murmanite by using "single-crystal" diffraction intensities contributed also by minor intergrown phases shows substantial residual peaks of electron density and some short bond-lengths. The difficulties encountered in properly refining the structures of the main phases are related to the unresolved contributions of the minor intergrown phases to the diffracted intensities. We suggest the ideal formulae (Na,{square})2{(Na,Ti)4[Nb2(O,H2O)4Si4O14](OH,F)2}•2H2O for epistolite and (Na,{square})2{(Na,Ti)4[Ti2(O,H2O)4Si4O14] (OH,F)2}•2H2O for murmanite.

Keywords: epistolite, murmanite, shkatulkalite, heterophyllosilicates, titanosilicates, epitaxy, electron microscopy, crystal structure, mero-plesiotype series.




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