Mendigite, Mn2Mn2MnCa(Si3O9)2, a new mineral species of the bustamite group from the Eifel volcanic region, Germany

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• 作者：N. V. Chukanov ; S. M. Aksenov ; R. K. Rastsvetaeva ; K. V. Van…
• 刊名：Geology of Ore Deposits
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：57
• 期：8
• 页码：721-731
• 全文大小：1,600 KB
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  Burnham, C.W., Ferrobustamite: the crystal structures of two Ca, Fe bustamite-type pyroxenoids: correction, Z. Kristallogr., 1975, vol. 142, pp. 450–452.
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• 作者单位：N. V. Chukanov (1)
  S. M. Aksenov (2)
  R. K. Rastsvetaeva (2)
  K. V. Van (3)
  D. I. Belakovskiy (4)
  I. V. Pekov (5)
  V. V. Gurzhiy (6)
  W. Schüller (7)
  B. Ternes (8)
  
  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia
  2. Institute of Crystallography, Russian Academy of Sciences, Leninsky pr. 59, Moscow, 117333, Russia
  3. Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia
  4. Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky pr. 18-2, Moscow, 119071, Russia
  5. Faculty of Geology, Moscow State University, Moscow, 119991, Russia
  6. Faculty of Geology, St. Petersburg State University, Universitskaya nab. 7/9, St Petersburg, 199034, Russia
  7. Im Straussenpesch 22, 53518, Adenau, Germany
  8. Bahnhofstrasse 45, 56727, Mayen, Germany
  
• 刊物主题：Mineral Resources;
• 出版者：Springer US
• ISSN：1555-6476

文摘

A new mineral, mendigite (IMA no. 2014-007), isostructural with bustamite, has been found in the In den Dellen pumice quarry near Mendig, Laacher Lake area, Eifel Mountains, Rhineland-Palatinate (Rheinland-Pfalz), Germany. Associated minerals are sanidine, nosean, rhodonite, tephroite, magnetite, and a pyrochlore-group mineral. Mendigite occurs as clusters of long-prismatic crystals (up to 0.1 × 0.2 × 2.5 mm in size) in cavities within sanidinite. The color is dark brown with a brown streak. Perfect cleavage is parallel to (001). D _calc = 3.56 g/cm3. The IR spectrum shows the absence of H₂O and OH groups. Mendigite is biaxial (–), α = 1.722 (calc), β = 1.782(5), γ = 1.796(5), 2V _meas = 50(10)°. The chemical composition (electron microprobe, mean of 4 point analyses, the Mn2+/Mn3+ ratio determined from structural data and charge-balance constraints) is as follows (wt %): 0.36 MgO, 10.78 CaO, 37.47 MnO, 2.91 Mn₂O₃, 4.42 Fe₂O₃, 1.08 Al₂O₃, 43.80 SiO₂, total 100.82. The empirical formula is Mn_2.00(Mn_1.33Ca_0.67) (Mn_0.50 2+ Mn_0.28 3+ Fe_0.15 3+ Mg_0.07)(Ca_0.80 (Mn_0.20 2+)(Si_5.57 Fe_0.27 3+ Al_0.16O₁₈). The idealized formula is Mn₂Mn₂MnCa(Si₃O₉)₂. The crystal structure has been refined for a single crystal. Mendigite is triclinic, space group \(P\bar 1\); the unit-cell parameters are a = 7.0993(4), b = 7.6370(5), c = 7.7037(4) Å, α = 79.58(1)°, β = 62.62(1)°, γ = 76.47(1)°; V = 359.29(4) Å3, Z = 1. The strongest reflections on the X-ray powder diffraction pattern [d, Å (I, %) (hkl)] are: 3.72 (32) (020), 3.40 (20) (002, 021), 3.199 (25) (012), 3.000 (26), (\(01\bar 2\), \(1\bar 20\)), 2.885 (100) (221, \(2\bar 11\), \(1\bar 21\)), 2.691 (21) (222, \(2\bar 10\)), 2.397 (21) (\(02\bar 2\), \(21\bar 1\), 203, 031), 1.774 (37) (412, \(3\bar 21\)). The type specimen is deposited in the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, registration number 4420/1. Original Russian Text © N.V. Chukanov, S.M. Aksenov, R.K. Rastsvetaeva, K.V. Van, D.I. Belakovskiy, I.V. Pekov, V.V. Gurzhiy, W. Schüller, B. Ternes, 2015, published in Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, 2015, No. 2, pp. 48–61.A new mineral, mendigite, and its name were approved by the Commission on New Minerals, Nomenclature, and Classification of the International Mineralogical Association on May 1, 2014, IMA no. 2014-007.