New data on ferriakasakaite-(La) and related minerals extending the compositional field of the epidote supergroup

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Marco E. Ciriotti
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New data on ferriakasakaite-(La) and related minerals extending the compositional field of the epidote supergroup

Messaggio da Marco E. Ciriotti » lun 26 feb, 2018 10:46

Prossima pubblicazione.

Referenza:
▪ Chukanov, N.V., Zubkova, N.V., Schäfer, C., Varlamov, D.A., Ermolaeva, V.N., Polekhovsky, Y.S., Jančev, S., Pekov, I.V., Pushcharovsky, D.Yu. (2018): New data on ferriakasakaite-(La) and related minerals extending the compositional field of the epidote supergroup. European Journal of Mineralogy, 30, (in press).
Marco E. Ciriotti

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Corrado
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Re: New data on ferriakasakaite-(La) and related minerals extending the compositional field of the epidote supergroup

Messaggio da Corrado » lun 26 feb, 2018 10:59

Dobbiamo iniziare a preoccuparci? :wink:
Corrado

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Marco E. Ciriotti
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Re: New data on ferriakasakaite-(La) and related minerals extending the compositional field of the epidote supergroup

Messaggio da Marco E. Ciriotti » lun 26 feb, 2018 11:12

Dobbiamo iniziare a preoccuparci? :wink:
Dobbiamo sbrigarci. A Nežilovo (che assomiglia abbastanza al nostro sito) sono presenti quasi tutti gli estremi.
Marco E. Ciriotti

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

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Marco E. Ciriotti
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Re: New data on ferriakasakaite-(La) and related minerals extending the compositional field of the epidote supergroup

Messaggio da Marco E. Ciriotti » gio 01 mar, 2018 12:22

Anche all'Eifel (Mendig) queste fasi non mancano...
Marco E. Ciriotti

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

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Marco E. Ciriotti
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Re: New data on ferriakasakaite-(La) and related minerals extending the compositional field of the epidote supergroup

Messaggio da Marco E. Ciriotti » sab 09 giu, 2018 14:43

Referenza:
▪ Chukanov, N.V., Zubkova, N.V., Schäfer, C., Varlamov, D.A., Ermolaeva, V.N., Polekhovsky, Y.S., Jančev, S., Pekov, I.V., Pushcharovsky, D.Yu. (2018): New data on ferriakasakaite-(La) and related minerals extending the compositional field of the epidote supergroup. European Journal of Mineralogy, 30, (in press).

Abstract:
Detailed studies of ferriakasakaite-(La) including determination of chemical composition and crystal structure, infrared spectroscopy, optical characteristics in reflected light and micro-indentation hardness have been carried out on a non-metamict sample from young nosean-bearing sanidinite from the Laach Lake volcanic complex, Eifel, Germany. The chemical composition is (electron microprobe, Fe2+: Fe3+ determined from structural data, wt.%): CaO 6.74, La2O3 13.35, Ce2O3 10.58, Pr2O3 0.42, Nd2O3 0.49, Sm2O3, 0.34, Eu2O3 0.18, Gd2O3 0.20, ThO2 0.43, UO2 0.10, MgO 0.89, MnO 9.98, Al2O3 11.47, Fe2O3 7.39, FeO 4.04, TiO2 1.32, SiO2 29.80, H2O (calc.) 1.49, total 99.22. The empirical formula is (Ca 0.68 Mn 2+ 0.32 ) Σ1.00 (La 0.49 Ce 0.39 Pr 0.02 Nd 0.02 Sm 0.01 Eu 0.01 Gd 0.01 Th 0.01 Ca 0.04 ) Σ1.00 (Fe 3+ 0.52 Fe 2+ 0.04 Al 0.34 Ti 4+ 0.10 )Σ 1.00 Al 1.00 (Mn 2+ 0.53 Fe 2+ 0.34 Mg 0.13 ) Σ1.00 (Si 2.98 Al 0.02 ) Σ3.00 O 12.00 (OH) (Ca0.68Mn2+0.32)Σ1.00(La0.49Ce0.39Pr0.02Nd0.02Sm0.01Eu0.01Gd0.01Th0.01Ca0.04)Σ1.00(Fe0.523+Fe0.042+Al0.34Ti0.104+)Σ1.00Al1.00(Mn0.532+Fe0.342+Mg0.13)Σ1.00(Si2.98Al0.02)Σ3.00O12.00(OH). The crystal structure was solved by direct methods and refined to R = 0.018 based on 1259 unique reflections with I > 2σ(I). The H atom was located. The mineral is monoclinic, space group P21/m, a = 8.9054(1), b = 5.7545(1), c = 10.1037(2)  Å, β = 114.103(2)°, V = 472.63(1) Å3. The IR spectrum confirms the presence of OH groups. Reflectance spectra of ferriakasakaite-(La) obtained in the visible range show reflectance minima at the wavelength of ∼590 nm. Various epidote-supergroup minerals including ferriakasakaite-(La), allanite-(Ce), Al-dominant (at the M1 site) analogue of ferriakasakaite-(Ce), piemontite, piemontite-(Pb), as well as Pb-, Zn- and Cu-bearing varieties of Fe3+-dominant (at the M1 site) analogues of piemontite and piemontite-(Pb), have been discovered in sulfide-free metasomatic rocks containing oxide/oxysalt compounds of chalcophile elements (Zn, Cu, Sb, and Pb), within the Pelagonian massif, Republic of Macedonia. Crystal chemical regularities of these minerals are discussed.
Marco E. Ciriotti

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