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Spectroscopy and X-ray structure refinement of sekaninaite from Dolní Bory (Czech Republic)

Published online by Cambridge University Press:  05 July 2018

F. Radica
Affiliation:
Dipartimento di Scienze Geologiche, Università degli Studi Roma Tre, Largo S. Leonardo Murialdo 1, 00146 Rome, Italy
F. Capitelli
Affiliation:
Istituto di Cristallografia, Consiglio Nazionale delle Ricerche (CNR), Via Salaria Km 29, 300, 00016 Monterotondo, Rome, Italy
F. Bellatreccia
Affiliation:
Dipartimento di Scienze Geologiche, Università degli Studi Roma Tre, Largo S. Leonardo Murialdo 1, 00146 Rome, Italy Laboratori Nazionali di Frascati – Istituto Nazionale di Fisica Nucleare (LNF – INFN), Via E. Fermi 40, 00044 Frascati, Rome, Italy
G. Della Ventura
Affiliation:
Dipartimento di Scienze Geologiche, Università degli Studi Roma Tre, Largo S. Leonardo Murialdo 1, 00146 Rome, Italy Laboratori Nazionali di Frascati – Istituto Nazionale di Fisica Nucleare (LNF – INFN), Via E. Fermi 40, 00044 Frascati, Rome, Italy Istituto Nazionale di Geofisica e Vulcanologia (INGV), Via di Vigna Murata 605, 00143 Rome, Italy
A. Cavallo
Affiliation:
Istituto Nazionale di Geofisica e Vulcanologia (INGV), Via di Vigna Murata 605, 00143 Rome, Italy
M. Piccinini
Affiliation:
Porto Conte Ricerche s.r.l., Strada Provinciale 55 Km 8, 400, 07041 Alghero, Sassari, Italy
F. C. Hawthorne
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada

Abstract

The crystal chemistry of sekaninaite from Dolní Bory, Czech Republic, was characterized by a multimethod approach. Particular emphasis was put on the characterization of the channel constituents (i.e. H2O and CO2). Electron microprobe analysis shows the sample to be close to the Fe endmember [XFe = Fe/(Fe+Mg) = 94%) with significant Mn (1.48 wt.%) present; laser ablation mass-spectrometry showed the presence of 0.42 wt.% Li2O. H2O and CO2 contents (1.48 and 0.17 wt.%, respectively) were determined via secondary-ion mass-spectrometry. Sample homogeneity was checked by Fourier-transform infrared (FTIR) imaging using a microscope equipped with a focal plane array detector. Single-crystal FTIR spectroscopy confirmed the presence of two types of H2O groups in different orientations (with prevalence of the type II orientation), and that CO2 is oriented preferentially normal to the crystallographic c axis. Using the Beer-Lambert relation, integrated molar coefficients, εi, were calculated for both types of H2O (εi H2O[I] = 6000±2000; εi H2O[II] = 13000±1000) and for CO2iCO2 = 2000±1000).

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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