Prossima pubblicazione.
Referenza:
▪ Callegari, A.M., Boiocchi, M., Zema, M., Tarantino, S.C. (2018): The crystal structure of hanksite, Na22K(CO3)2(SO4)9Cl, refined from high-resolution X-ray diffraction data. Neues Jahrbuch für Mineralogie - Abhandlungen: Journal of Mineralogy and Geochemistry, 195, (in press).
Abstract:
The crystal structure of hanksite, Na22K(CO3)2(SO4)9Cl, has been re-evaluated on the basis of high-resolution X-ray diffraction data (MoKα) from a single crystal from the type locality Searles Lake. Hanksite is hexagonal with a = 10.4896(3), c = 21.2415(6) Å, V = 2024.11(13) Å3, space group P63/m (no.176), Z = 2. Anisotropic structure refinement converges to final R1 of 4.0 % for 6792 reflections with IO > 2σ(IO) in the &thetas; range 2 – 55°. The structure of hanksite consists of two interconnected chains made of KO12 and NaO6 polyhedra extending along c and contains additional 6-fold and 7-fold Na-centered polyhedra (not involved in the formation of the chains) and CO3 and SO4 groups. On the basis of geometrical features and bond valence analyses, the coordination number for the K site has been assumed as twelve and the environment of the Na4-centred polyhedron has been described as a six-sided half-shell, rather than as an irregular octahedron.
Crystal structure of hanksite
- Marco E. Ciriotti
- Messaggi: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
Crystal structure of hanksite
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: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
Re: Crystal structure of hanksite
Pubblicazione effettuata.
Referenza:
▪ Callegari, A.M., Boiocchi, M., Zema, M., Tarantino, S.C. (2018): The crystal structure of hanksite, Na22K(CO3)2(SO4)9Cl, refined from high-resolution X-ray diffraction data. Neues Jahrbuch für Mineralogie - Abhandlungen: Journal of Mineralogy and Geochemistry, 195, 115-122.
Abstract:
The crystal structure of hanksite, Na22K(CO3)2(SO4)9Cl, has been re-evaluated on the basis of high-resolution X-ray diffraction data (MoKα) from a single crystal from the type locality Searles Lake. Hanksite is hexagonal with a = 10.4896(3), c = 21.2415(6) Å, V = 2024.11(13) Å3, space group P63/m (no.176), Z = 2. Anisotropic structure refinement converges to final R1 of 4.0 % for 6792 reflections with IO > 2σ(IO) in the &thetas; range 2 – 55°. The structure of hanksite consists of two interconnected chains made of KO12 and NaO6 polyhedra extending along c and contains additional 6-fold and 7-fold Na-centered polyhedra (not involved in the formation of the chains) and CO3 and SO4 groups. On the basis of geometrical features and bond valence analyses, the coordination number for the K site has been assumed as twelve and the environment of the Na4-centred polyhedron has been described as a six-sided half-shell, rather than as an irregular octahedron.
Referenza:
▪ Callegari, A.M., Boiocchi, M., Zema, M., Tarantino, S.C. (2018): The crystal structure of hanksite, Na22K(CO3)2(SO4)9Cl, refined from high-resolution X-ray diffraction data. Neues Jahrbuch für Mineralogie - Abhandlungen: Journal of Mineralogy and Geochemistry, 195, 115-122.
Abstract:
The crystal structure of hanksite, Na22K(CO3)2(SO4)9Cl, has been re-evaluated on the basis of high-resolution X-ray diffraction data (MoKα) from a single crystal from the type locality Searles Lake. Hanksite is hexagonal with a = 10.4896(3), c = 21.2415(6) Å, V = 2024.11(13) Å3, space group P63/m (no.176), Z = 2. Anisotropic structure refinement converges to final R1 of 4.0 % for 6792 reflections with IO > 2σ(IO) in the &thetas; range 2 – 55°. The structure of hanksite consists of two interconnected chains made of KO12 and NaO6 polyhedra extending along c and contains additional 6-fold and 7-fold Na-centered polyhedra (not involved in the formation of the chains) and CO3 and SO4 groups. On the basis of geometrical features and bond valence analyses, the coordination number for the K site has been assumed as twelve and the environment of the Na4-centred polyhedron has been described as a six-sided half-shell, rather than as an irregular octahedron.
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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