New data on mineralogy and crystal chemistry of the lovozerite group: unusual varieties of kazakovite and litvinskite

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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New data on mineralogy and crystal chemistry of the lovozerite group: unusual varieties of kazakovite and litvinskite

Messaggio da Marco E. Ciriotti » mar 09 nov, 2021 14:02

Referenza:
▪ Zubkova, N.V., Pekov, I.V., Chukanov, N.V., Grishin, V.G., Koshlyakova, N.N., Yapaskurt, V.O., Ksenofontov, D.A., Turchkova, A.G., Pushcharovsky, D.Yu. (2021): New data on mineralogy and crystal chemistry of the lovozerite group: unusual varieties of kazakovite and litvinskite. Zapiski RMO (Proceedings of the Russian Mineralogical Society), 150, 134-152.

Abstract:
Unusual chemical and structural varieties of two lovozerite-group minerals from the Lovozero alkaline complex (Kola Peninsula) were studied by means of electron microprobe analysis, single-crystal X-ray diffraction and IR spectroscopy. A Zr- and Fe-enriched variety of kazakovite with the composition Na6.20U0.01(H3O)0.25(Mn0.72Ca0.10)Σ0.82(Ti0.61Zr0.18 Fe3+0,18)Σ0.97Si6O17.83(OH)0.17 was found in the Palitra pegmatite at Mt. Kedykverpakhk. The mineral is trigonal, R-3m, a = 10.2622(5), с = 13.0884(7) Å, V = 1193.71(13) Å3; Rhkl = 0.0383. The variety of trigonal litvinskite from Mt. Alluaiv is characterized by the lowest content of large cations sum (Na,Ca and Mn) and previously unknown for this mineral species space group R3m. Its composition is Na2.05(H2O)0.64(Mn0.13Ca0.02)Σ0.15(Zr0.93Ti0.06 )Σ1.01Si6O12.36(OH)5.64, and unit cell parameters are: a = 10.1880(10), с = 13.1209(16) Å, V = 1179.4(3) Å3; Rhkl = 0.0665. Thepresence of hydronium H3O+ was first found for lovozerite-group minerals. The way of formation of kapustinite and litvinskite as a result of the step-by-step townendite alteration process (decationization with the replacing of the corresponding part of O2– by OH–) is discussed.

Ndr: Qualche perplessità sulla formula della litvinskite presente nell'abstract.
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: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: New data on mineralogy and crystal chemistry of the lovozerite group: unusual varieties of kazakovite and litvinskit

Messaggio da Marco E. Ciriotti » lun 13 feb, 2023 13:42

Anche in:
▪ Zubkova, N.V., Pekov, I.V., Chukanov, N.V., Grishin, V.G., Koshlyakova, N.N., Yapaskurt, V.O., Ksenofontov, D.A., Turchkova, A.G., Pushcharovsky, D.Yu. (2022): New data on mineralogy and crystal chemistry of the lovozerite group: unusual varieties of kazakovite and litvinskite. Geology of Ore Deposits, 64, 657–669.
Marco E. Ciriotti

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

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