Vanadium-rich muscovite from Austria: Crystal structure, chemical analysis and spectroscopic investigations

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Marco E. Ciriotti
Messaggi: 25806
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Vanadium-rich muscovite from Austria: Crystal structure, chemical analysis and spectroscopic investigations

Messaggio da Marco E. Ciriotti » lun 06 mag, 2019 17:08

Prossima pubblicazione.

Referenza:
▪ Ertl, A., Rakovan, J., Highes, J.M., Bernhardt, H.-J., Rossman, G.R. (2019): Vanadium-rich Muscovite from Austria: Crystal Structure, Chemical Analysis, and Spectroscopic Investigations. Canadian Mineralogy, 57, 383-389.

Abstract:
The crystal structure of a green, transparent, vanadium-rich muscovite-2M1 (V2O3 = 11.35 wt.%, one of the highest amounts reported to date in muscovite) with the optimized formula (K0.94Na0.06)M2(Al1.20V3+0.61Mg0.12Cr3+0.07)T1(Si1.54Al0.46)T2(Si1.54Al0.46)O10(OH)2 and space group C2/c, a 5.2255(6), b 9.0704(10), c 20.0321(21) Å, β 95.773(2)°, Z = 4 has been refined to R = 6.97% for 1070 unique reflections (MoKα). This muscovite, which occurs in small quartz veins in graphite schist from Weinberg mountain, near the village of Amstall, Lower Austria, is distinctly low in Cr (Cr2O3 ∼1.4 wt.%) and Mg (MgO ∼1.1 wt.%); Fe, Mn, and Ti are below detection limit. All octahedral cations occupy the M2 site, and the average octahedral bond (M2–O) distance is 1.953 Å. Structural distortions include α = 8.89° and Δz = 0.193 Å, resulting in an interlayer spacing of 3.35 Å. The optical absorption spectrum of this V-rich muscovite shows absorption features at 427 and 609 nm that define a transmission window centered at 523 nm. These absorption features are consistent with those expected for V3+ in mica, but the 609 nm band has a slightly longer wavelength than in low-V micas.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 25806
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: Vanadium-rich muscovite from Austria: Crystal structure, chemical analysis and spectroscopic investigations

Messaggio da Marco E. Ciriotti » mer 22 mag, 2019 10:06

Pubblicazione effettuata.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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