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Parádsasvárite, a new member of the malachite-rosasite group from Parádsasvár, Mátra Mountains, Hungary

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Abstract

Parádsasvárite (IMA No. 2012-077) was found in the Nagy-Lápafő area, Parádsasvár, Mátra Mountains, Hungary. It forms pale beige, globular aggregates up to 0.2 mm in diameter on calcite. Associated secondary minerals are smithsonite, hemimorphite, hydrozincite, aurichalcite and rosasite. The mineral was formed as an alteration product of sphalerite and chalcopyrite in a carbonate-rich environment. Parádsasvárite is translucent with a weakly vitreous, dull or silky lustre and white streak. Its Mohs hardness is about 2–3, cleavage and parting were not observed. It is brittle; the fracture is finely fibrous. Average of nine electron-microprobe analyses gave ZnO 58.08, CuO 12.60, PbO 1.27, CO2 (calc.) 19.50, H2O (calc.) 7.94, total 99.39 wt.%, corresponding to the empirical formula (Zn0.62Cu0.36Pb0.01)Σ0.99Zn1.00(CO3)(OH)2. The seven strongest lines in the X-ray powder diffraction pattern are [dhkl in Å (Iobs %, hkl)] 6.054 (67, 200), 5.085 (100, 210), 3.703 (87, 310 and 220), 3.021 (25, 400 and 130), 2.971 (25, −211 and 001), 2.603 (62, −221) and 2.539 (36, 420). According to its X-ray powder diffraction data and chemical formula, parádsasvárite belongs to the malachite-rosasite group and it is isostructural with rosasite. It is monoclinic, space group P21/a, a = 12.92(1), b = 9.372(7), c = 3.159(4) Å, β = 110.4(1)°, V = 358.5(5) Å3, Z = 4.

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Acknowledgments

We thank Sándor Klaj (Pécs) for providing of the holotype sample and László Tóth (Velence) for the high quality photomicrograph of parádsasvárite. We also acknowledge Philip Rawlinson (Corvinus University, Budapest) for the English text revision. Finally, the authors would like to thank the two anonymous reviewers, as well as the Associate Editor Anton Beran for their valuable comments and suggestions to improve the manuscript.

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Authors and Affiliations

  1. Department of Mineralogy, Herman Ottó Museum, Kossuth u. 13, 3525, Miskolc, Hungary

    Béla Fehér

  2. Department of Mineralogy and Petrology, University of Miskolc, 3515, Miskolc-Egyetemváros, Hungary

    Sándor Szakáll & Norbert Zajzon

  3. Institute of Materials and Environmental Chemistry, Research Center for Natural Sciences, Hungarian Academy of Sciences, Pusztaszeri út 59-67, 1025, Budapest, Hungary

    Judith Mihály

Authors
  1. Béla Fehér
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  2. Sándor Szakáll
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  3. Norbert Zajzon
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  4. Judith Mihály
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Correspondence to Béla Fehér.

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Editorial handling: A. Beran

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Fehér, B., Szakáll, S., Zajzon, N. et al. Parádsasvárite, a new member of the malachite-rosasite group from Parádsasvár, Mátra Mountains, Hungary. Miner Petrol 109, 405–411 (2015). https://doi.org/10.1007/s00710-015-0370-x

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