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Minerals 2018, 8(10), 449; https://doi.org/10.3390/min8100449

Nöggerathite-(Ce), (Ce,Ca)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14, a New Zirconolite-Related Mineral from the Eifel Volcanic Region, Germany

1
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, 142432 Moscow, Russia
2
Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia
3
Institute of Earth Sciences, St Petersburg State University, Universitetskaya Nab. 7/9, 199034 St Petersburg, Russia
4
Nanomaterials Research Center, Kola Science Centre, Russian Academy of Sciences, Fersman str. 14, 184209 Apatity, Murmansk Region, Russia
5
Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygin str. 19, 119991 Moscow, Russia
6
Gustav Stresemann-Strasse 34, 74257 Untereisesheim, Germany
7
Bahnhofstrasse 45, 56727 Mayen, Germany
8
Im Straußenpesch 22, 53518 Adenau, Germany
9
Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, 142432 Moscow, Russia
*
Author to whom correspondence should be addressed.
Received: 7 September 2018 / Revised: 2 October 2018 / Accepted: 3 October 2018 / Published: 12 October 2018
(This article belongs to the Special Issue New Mineral Species and Their Crystal Structures)
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Abstract

The new mineral nöggerathite-(Ce) was discovered in a sanidinite volcanic ejectum from the Laach Lake (Laacher See) paleovolcano in the Eifel region, Rhineland-Palatinate, Germany. Associated minerals are sanidine, dark mica, magnetite, baddeleyite, nosean, and a chevkinite-group mineral. Nöggerathite-(Ce) has a color that ranges from brown to deep brownish red, with adamantine luster; the streak is brownish red. It occurs in cavities of sanidinite and forms long prismatic crystals measuring up to 0.02 × 0.03 × 1.0 mm, with twins and random intergrowths. Its density calculated using the empirical formula is 5.332 g/cm3. The Vickers hardness number (VHN) is 615 kgf/mm2, which corresponds to a Mohs’ hardness of 5½. The mean refractive index calculated using the Gladstone–Dale equation is 2.267. The Raman spectrum shows the absence of hydrogen-bearing groups. The chemical composition (electron microprobe holotype/cotype in wt %) is as follows: CaO 5.45/5.29, MnO 4.19/4.16, FeO 7.63/6.62, Al2O3 0.27/0.59, Y2O3 0.00/0.90, La2O3 3.17/3.64, Ce2O3 11.48/11.22, Pr2O3 1.04/0.92, Nd2O3 2.18/2.46, ThO2 2.32/1.98, TiO2 17.78/18.69, ZrO2 27.01/27.69, Nb2O5 17.04/15.77, total 99.59/99.82, respectively. The empirical formulae based on 14 O atoms per formula unit (apfu) are: (Ce0.59La0.165Nd0.11Pr0.05)Σ0.915Ca0.82Th0.07Mn0.50Fe0.90Al0.045Zr1.86Ti1.88Nb1.07O14 (holotype), and (Ce0.57La0.19Nd0.12Pr0.05Y0.06)Σ0.99Ca0.79Th0.06Mn0.49Fe0.77Al0.10Zr1.89Ti1.96Nb1.00O14 (cotype). The simplified formula is (Ce,Ca)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14. Nöggerathite-(Ce) is orthorhombic, of the space group Cmca. The unit cell parameters are: a = 7.2985(3), b = 14.1454(4), c = 10.1607(4) Å, and V = 1048.99(7) Å3. The crystal structure was solved using single-crystal X-ray diffraction data. Nöggerathite-(Ce) is an analogue of zirconolite-3O, ideally CaZrTi2O7, with Nb dominant over Ti in one of two octahedral sites and REE dominant over Ca in the eight-fold coordinated site. The strongest lines of the powder X-ray diffraction pattern (d, Å (I, %) (hkl)) are: 2.963 (91) (202), 2.903 (100) (042), 2.540 (39) (004), 1.823 (15) (400), 1.796 (51) (244), 1.543 (20) (442), and 1.519 (16) (282), respectively. The type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia (registration number 5123/1). View Full-Text
Keywords: nöggerathite-(Ce); new mineral; zirconolite; laachite; sanidinite; crystal structure; alkaline volcanic rock; Laacher See; Eifel nöggerathite-(Ce); new mineral; zirconolite; laachite; sanidinite; crystal structure; alkaline volcanic rock; Laacher See; Eifel
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Chukanov, N.V.; Zubkova, N.V.; Britvin, S.N.; Pekov, I.V.; Vigasina, M.F.; Schäfer, C.; Ternes, B.; Schüller, W.; Polekhovsky, Y.S.; Ermolaeva, V.N.; Pushcharovsky, D.Y. Nöggerathite-(Ce), (Ce,Ca)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14, a New Zirconolite-Related Mineral from the Eifel Volcanic Region, Germany. Minerals 2018, 8, 449.

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