Prossima pubblicazione.
Referenza:
▪ Perchiazzi, N., Hålenius, U., Vignola, P., Demitri, N. (2019): Crystal-chemical study of ecdemite from Harstigen, a new natural member of the layered lead oxyhalides group. European Journal of Mineralogy, 31, (in press).
Abstract:
Ecdemite from Harstigen, Värmland, Central Sweden, was studied through Raman and FTIR spectroscopy, electron-microprobe techniques, synchrotron powder and single-crystal diffraction. The ideal mineral formula proposed by Palache, Pb6Cl4As2O7, is confirmed. In contrast to previous suggestions, however, the present study demonstrates that the mineral is monoclinic, with space-group type P21 and unit-cell parameters a = 10.828(4) Å, b = 10.826(2) Å, c = 6.970(1) Å, β = 113.26°(2). The crystal-structural study of ecdemite shows that the mineral can be considered as made up of regularly alternating Cl layers and litharge-like defective layers, also hosting As cations, with the representative formula {Pb2[Pb4O](AsO3)2}4+, in a 1:1 ratio. These features indicate that ecdemite can be considered as a new member of the layered lead oxyhalides group.
NdR: Dal solo abstract nulla si precisa se l'ecdemite è un polimorfo (o no) della heliophyillite e se quest'ultima è (oppure no) una valida specie minerale. Probabilmente nel testo ci saranno ulteriori informazioni.
Crystal-chemical study of ecdemite from Harstigen
- Marco E. Ciriotti
- Messaggi: 31645
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
Crystal-chemical study of ecdemite from Harstigen
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
- Marco E. Ciriotti
- Messaggi: 31645
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
Re: Crystal-chemical study of ecdemite from Harstigen
Pubblicazione effettuata.
Referenza:
▪ Perchiazzi, N., Hålenius, U., Vignola, P., Demitri, N. (2019): Crystal-chemical study of ecdemite from Harstigen, a new natural member of the layered lead oxyhalides group. European Journal of Mineralogy, 31, 609-617.
Referenza:
▪ Perchiazzi, N., Hålenius, U., Vignola, P., Demitri, N. (2019): Crystal-chemical study of ecdemite from Harstigen, a new natural member of the layered lead oxyhalides group. European Journal of Mineralogy, 31, 609-617.
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
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