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Florencite-(Sm)—(Sm,Nd)Al3(PO4)2(OH)6: A new mineral species of the alunite-jarosite group from the subpolar urals

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Abstract

Florencite-(Sm), a new mineral species of the florencite subgroup, was found in association with xenotime-(Y) in quartz veins of the Maldynyrd Range of the Subpolar Urals as thin zones within rhombohedral crystals of florencite-(Ce) with faceting by \(\{ 01\bar 11\} \) and \(\{ 10\bar 12\} \). The thickness of particular florencite-(Sm) zones is 0.01–0.1 mm, and the total thickness of a series of such zones is 1–3 mm. Florencite-(Sm) is colorless and pale pink or pale yellow with white streaks; its Mohs hardness is 5.5–6.0. Its measured and calculated densities are 3.70 and 3.743 g/cm3, respectively. The mineral is transparent, nonpleochroic, and uniaxial (positive), and ω = 1.704(2) and ɛ = 1.713(2). The electron beam’s fluorescence spectrum was 592 nm (intense green luminescence of Sm3+) and 558 nm (yellow luminescence of Nd3+). The chemical composition was as follows (microprobe, average of 2 WDS, wt %): 0.62 La2O3, 3.29 Ce2O3, 1.05 Pr2O3, 10.31 Nd2O3, 12.62 Sm2O3, 0.41 Eu2O3, 2.30 Gd2O3, 0.13 Dy2O3, 0.71 SrO, 0.35 CaO, 29.89 Al2O3, 26.14 P2O5, 0.85 SO3, 0.09 SiO2, 88.76 in total; 10.74 H2O (meas.). The empirical formula based on 14 oxygen atoms is (Sm0.38Nd0.32Gd0.07Ce0.10Pr0.03La0.02Eu0.01Sr0.04Ca0.03)1.0Al3.04(P1.91S0.05Si0.01)1.97O14H5.92. The idealized formula is (Sm,Nd)Al3(PO4)2(OH)6. Mineral is trigonal, space group R3m, a = 6.972(4), c = 16.182(7) Å, V = 681.2 Å3, Z = 3. The XRD pattern is as follows: dln (I) (hkl): 2.925 (10) (113), 1.881 (6) (303), 2.161 (5) (107), 5.65 (4) (101), and 3.479 (4) (110). The IR spectrum: 466, 510, 621, 1036, 1105, 1223, 2957, and 3374 cm−1.

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Authors and Affiliations

  1. Institute of Mineralogy, Ural Branch, Russian Academy of Sciences, Miass, Chelyabinsk oblast, 456317, Russia

    S. A. Repina, V. I. Popova, E. I. Churin & E. V. Belogub

  2. Institute of Geology and Geochemistry, Ural Division, Russian Academy of Sciences, Pochtovyi per. 7, Yekaterinburg, 620151, Russia

    V. V. Khiller

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  1. S. A. Repina
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  2. V. I. Popova
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  4. E. V. Belogub
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Correspondence to S. A. Repina.

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Original Russian Text © S.A. Repina, V.I. Popova, E.I. Churin, E.V. Belogub, V.V. Khiller, 2010, published in Zapiski RMO (Proceedings of the Russian Mineralogical Society), 2010, No. 4, pp. 16–25.

A new mineral species florencite-(Sm) and its name were recommended by the Commission on New Minerals and Mineral Names of the Russian Mineralogical Society on September 9, 2009 and approved by the Commission on New Minerals, Nomenclature, and Classification of the International Mineralogical Association on November 30, 2009 (IMA no. 2009-074).

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Repina, S.A., Popova, V.I., Churin, E.I. et al. Florencite-(Sm)—(Sm,Nd)Al3(PO4)2(OH)6: A new mineral species of the alunite-jarosite group from the subpolar urals. Geol. Ore Deposits 53, 564–574 (2011). https://doi.org/10.1134/S1075701511070191

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