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 . 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.
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Research Article|
March 01, 2018
New data on ferriakasakaite-(La) and related minerals extending the compositional field of the epidote supergroup
Nikita V. Chukanov;
1
Institute of Problems of Chemical Physics, Russian Academy of Sciences
, Chernogolovka, Moscow region142432, Russia
2
Faculty of Geology, Moscow State University
, Vorobievy Gory, Moscow
, 119991Russia
Corresponding author, e-mail: chukanov@icp.ac.ru.
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Natalia V. Zubkova;
Natalia V. Zubkova
2
Faculty of Geology, Moscow State University
, Vorobievy Gory, Moscow
, 119991Russia
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Christof Schäfer;
Christof Schäfer
3
Südwestdeutsche Salzwerke AG, Salzgrund 67
, 74076Heilbronn, Germany
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Dmitry A. Varlamov;
Dmitry A. Varlamov
1
Institute of Problems of Chemical Physics, Russian Academy of Sciences
, Chernogolovka, Moscow region142432, Russia
4
Institute of Experimental Mineralogy, Russian Academy of Sciences
, Chernogolovka, Moscow Region142432Russia
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vera N. Ermolaeva;
vera N. Ermolaeva
5
Department of Mineral Deposits, Faculty of Geology, St. Petersburg State University
, Universitetskaya nab. 7/9, St. Petersburg199034, Russia
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Yury S. polekhovsky;
Yury S. polekhovsky
5
Department of Mineral Deposits, Faculty of Geology, St. Petersburg State University
, Universitetskaya nab. 7/9, St. Petersburg199034, Russia
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Simeon Jančev;
Simeon Jančev
6
Faculty of Technology and Metallurgy, Saints Cyril and Methodius University, Ruger Boskovic 16
, 1000Skopje, Republic of Macedonia
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Igor V. Pekov;
Igor V. Pekov
2
Faculty of Geology, Moscow State University
, Vorobievy Gory, Moscow
, 119991Russia
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Dmitry Yu. Pushcharovsky
Dmitry Yu. Pushcharovsky
2
Faculty of Geology, Moscow State University
, Vorobievy Gory, Moscow
, 119991Russia
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European Journal of Mineralogy (2018) 30 (2): 323–332.
Article history
received:
10 Aug 2017
rev-recd:
10 Oct 2017
accepted:
05 Dec 2017
first online:
14 Aug 2018
Citation
Nikita V. Chukanov, Natalia V. Zubkova, Christof Schäfer, Dmitry A. Varlamov, vera N. Ermolaeva, Yury S. polekhovsky, Simeon Jančev, Igor V. Pekov, Dmitry Yu. Pushcharovsky; New data on ferriakasakaite-(La) and related minerals extending the compositional field of the epidote supergroup. European Journal of Mineralogy 2018;; 30 (2): 323–332. doi: https://doi.org/10.1127/ejm/2018/0030-2716
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Index Terms/Descriptors
- Central Europe
- chemical composition
- crystal chemistry
- crystal structure
- Eifel
- electron probe data
- epidote group
- Europe
- formula
- Germany
- infrared spectra
- Laacher See
- Macedonia
- optical properties
- orthosilicates
- refinement
- reflectance
- Rhenish Schiefergebirge
- Rhineland-Palatinate Germany
- silicates
- sorosilicates
- Southern Europe
- spectra
- Pelagonian Massif
- Nezilovo Macedonia
- ferriakasakaite
Latitude & Longitude