Hostname: page-component-78c5997874-fbnjt Total loading time: 0 Render date: 2024-11-04T19:03:03.247Z Has data issue: false hasContentIssue false
  • English
  • Français

Mendeleevite-(Nd), (Cs,□)6 (□,Cs)6 (□,K)6 (REE,Ca)30(Si70O175)(OH,H2O,F)35, a new mineral from the Darai-Pioz alkaline massif, Tajikistan

Published online by Cambridge University Press:  02 January 2018

Atali A. Agakhanov ,
Leonid A. Pautov ,
Elena Sokolova ,
Frank C. Hawthorne ,
Vladimir Yu Karpenko ,
Oleg I. Siidra  and
Viktor K. Garanin
Atali A. Agakhanov
Affiliation:
Department of Crystallography, St. Petersburg State University, University Embankment 7/9, St. Petersburg, 119034 Russia Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskii Pr-t, 18-2, Moscow, 117071 Russia
Leonid A. Pautov
Affiliation:
Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskii Pr-t, 18-2, Moscow, 117071 Russia
Elena Sokolova*
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
Frank C. Hawthorne
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
Vladimir Yu Karpenko
Affiliation:
Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskii Pr-t, 18-2, Moscow, 117071 Russia
Oleg I. Siidra
Affiliation:
Department of Crystallography, St. Petersburg State University, University Embankment 7/9, St. Petersburg, 119034 Russia
Viktor K. Garanin
Affiliation:
Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskii Pr-t, 18-2, Moscow, 117071 Russia
*
*E-mail: [email protected]
Get access Rights & Permissions [Opens in a new window]

Abstract

Mendeleevite-(Nd), (Cs,□)6(□,Cs)6(□,K)6(REE,Ca)30(Si70O175)(OH,H2O,F)35 is a new mineral from the Darai-Pioz alkaline massif, Tajikistan. Mendeleevite-(Nd) was found in a pectolite aggregate in silexites (quartz-rich rocks) which consist of fine to medium pectolite grains, quartz, aegirine and fluorite, with minor khvorovite, mendeleevite-(Ce), sokolovaite, hyalotekite, orlovite, kirchhoffite, pekovite, neptunite, zeravshanite, senkevichite, nordite-(Nd), alamosite, pyrochlore-group minerals and baratovite. Mendeleevite-(Nd) forms colourless cubic crystals 10–40 μm in size; it has a vitreous lustre and a Mohs hardness of 5–5.5; Dmeas. = 3.20(2) g/cm3, Dcalc. = 3.155 g/cm3. Mendeleevite-(Nd) is optically isotropic, with the refractive index n = 1.582(2). Mendeleevite-(Nd) is cubic, space group Pm3̄, a = 21.9106(4) Å; Z = 2. The six strongest reflections in the powder X-ray diffraction pattern are [d (Å), I (%), (h k l)] are: 11.01, 100, (0 0 2); 15.63, 55, (0 1 1); 3.47, 42, (2 0 6); 3.099, 42, (3 4 5); 2.192, 42, (0 0 10); 1.819, 41, (3 6 10). Chemical analysis by electron microprobe gave SiO2 42.30, Ce2O3 10.12, La2O3 3.60, Nd2O3 16.19, Pr2O3 2.79, Sm2O3 4.19, Gd2O3 1.69, Eu2O3 0.47, SrO 2.99, CaO 2.20, Cs2O 8.50, K2O 0.85, H2O 3.85, F 1.25, –O = F2 –0.53, sum 100.46 wt.%, with H2O calculated by analogy with mendeleevite-(Ce). The empirical formula based on 210 (O + F) apfu, with F + OH + H2O = 35 pfu, is Cs6(□4.20K1.80)∑6{[(Nd9.57Ce6.13Sm2.39La2.20Pr1.68Gd0.93Eu0.27)∑23.17(Ca3.90Sr2.87)∑6.77]∑29.94□0.06}∑30(Si70.03O175)(OH14.47F6.54)∑21.01 (H2O)14, Z = 2. The simplified and ideal formulae are (Cs,□)6 (□,Cs)6(□,K)6 (REE,Ca)30 (Si70O175)(OH, H2O,F)35 and Cs6(REE23Ca7)(Si70O175)(OH,F)19(H2O)16, respectively. The compatibility index (from measured density) = – 0.039 (excellent). Mendeleevite-(Nd) is a Nd analogue of mendeleevite-(Ce), (Cs,□)6(□,Cs)6(□,K)6(REE,Ca,□)30(Si70O175)(H2O,OH,F,□)35. Both minerals are named after Dmitri Mendeleev (1834–1907), the great Russian chemist, author of the periodic table of chemical elements, who has had a significant impact on the development of natural sciences and industry, both in Russia and around the world.

Keywords

mendeleevite-(Nd)new mineral speciesmendeleevite-(Ce)alkaline rocksDarai-Pioz massifTajikistanelectron microprobe analysis
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 1 , February 2017 , pp. 135 - 141
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Agakhanov, A.A., Pautov, L.A., Belakovskiy, D.I., Sokolova, E. and Hawthorne, F.C. (2003) Telyushenkoite, CsNa6[Be2(Si,A1,Zn)18O39F2] - a new cesium mineral of the leifite group. New Data on Minerals, 38, 5–8.Google Scholar
Agakhanov, A.A., Pautov, L.A., Uvarova, Yu.A., Sokolova, E.V., Hawthorne, F.C. and Karpenko, V.Yu. (2005) Senkevichite, CsKNaCa2TiO[Si7O18(OH)], a new mineral. New Data on Minerals, 40, 17–22.Google Scholar
Agakhanov, A.A., Pautov, L.A., Karpenko, V.Yu., Sokolova, E. and Hawthorne, F.C. (2012) Kirchhoffite, CsBSi2O6, a new mineral species from the Darai-Pioz alkaline massif, Tajikistan: Description and crystal structure. The Canadian Mineralogist, 50, 523–529.CrossRefGoogle Scholar
Agakhanov, A. A., Pautov, L.A., Sokolova, E., Hawthorne, F.C., Karpenko, V.Yu., Siidra, O.I. and Muftakhov, V.A. (2015) Odigitriaite, IMA 2015-028. Mineralogical Magazine, 79, 94–947.Google Scholar
Belakovskiy, D.I. (1991) Die seltenen Mineralien von Dara-i-Pioz im Hochgebirge Tadshikistans. Lapis, 16 (12), 42–48.Google Scholar
Cámara, F., Sokolova, E., Abdu, Y and Hawthorne, F.C. (2010) The crystal structures of niobophyllite, kupletskite-(Cs) and Sn-rich astrophyllite; revisions to the crystal chemistry of the astrophyllite-group minerals. The Canadian Mineralogist, 48, 1–16.CrossRefGoogle Scholar
Dusmatov, V.D. (1968) On mineralogy of one alkaline massif. Pp. 134-135 in: Alkaline Rocks of Kirgizia and Kazakhstan. Ilym, Frunze, Russia [in Russian].Google Scholar
Dusmatov, V.D. (1971) Mineralogy of the Darai-Pioz Alkaline Massif (Southern Tien-Shan). PhD dissertation, Institute of Mineralogy, Geochemistry and Crystal Chemistry of Rare Elements, Moscow, 171 pp. [in Russian].Google Scholar
Krivovichev, S.V. (2013) Structural complexity of minerals: information storage and processing in the mineral world. Mineralogical Magazine, 77, 275–326.CrossRefGoogle Scholar
Mandarino, J.A. (1981) The Gladstone-Dale relationship IV. The compatibility concept and its application. The Canadian Mineralogist, 19, 441–450.Google Scholar
Pautov, L.A., Agakhanov, A.A., Uvarova, Y.A., Sokolova, E.V. and Hawthorne, F.C. (2004) Zeravshanite, Cs4Na2Zr3(Si18O4 new cesium mineral from Dara-i-Pioz massif (Tajikistan). New Data on Minerals, 39, 21–25.Google Scholar
Pautov, L.A., Agakhanov, A.A. and Bekenova, G.K. (2006) Sokolovaite CsLi2AlSi4O10F2 - a new mineral species of the mica group. New Data on Minerals, 41, 5–13.Google Scholar
Pautov, L.A., Agakhanov, A.A., Karpenko, V.Yu., Sokolova, E. and Hawthorne, F.C. (2013) Mendeleevite-(Ce), (Cs,D)6(n,Cs)6(n,K)6(REE, Ca,D)3 5)(H2O,OH,F,Q)35: a new mineral from the Darai-Pioz massif, Tajikistan. Doklady Earth Sciences, 452(2) 1023–1026.CrossRefGoogle Scholar
Pouchou, J.L. and Pichoir, E (1985) “PAP” (jρΖ) procedure for improved quantitative microanalysis. Pp. 104-106 in: Microbeam Analysis (J.T. Armstrong, editor). San Francisco Press, San Francisco, California, USA.Google Scholar
Sokolova, E., Huminicki, D.M.C., Hawthorne, F.C., Agakhanov, A.A., Pautov, L.A. and Grew, E.S. (2002) The crystal chemistry of teluyshenkoite and leifite, A Na6 [Be2 Al3 Si15 O39 F2], A = Cs, Na. The Canadian Mineralogist, 40, 183–192.CrossRefGoogle Scholar
Sokolova, E., Hawthorne, EC, Pautov, L.A., Agakhanov, A.A. and Karpenko, V.Yu. (2011) The crystal structure and crystal chemistry of mendeleevite-(Ce), (Cs,Q)6 a potential microporous material. Mineralogical Magazine, 75, 2583–2596.CrossRefGoogle Scholar
Uvarova, Y.A., Sokolova, E., Hawthorne, EC, Pautov, L. A and Agakhanov, A.A. (2004) A novel [Si8O45]18-sheet in the crystal structure of zeravshanite, Cs4Na2Zr3Si18O45(H2O)2 . The Canadian Mineralogist, 42, 125–134.CrossRefGoogle Scholar
Uvarova, Y.A., Sokolova, E., Hawthorne, EC, Agakhanov, A.A., Pautov, L.A. and Karpenko, V.Yu. (2006) The crystal chemistry of senkevichite, CsKNaCa2TiO[Si7 O1 8(OH)], from the Dara-i-Pioz alkaline massif, northern Tajikistan. The Canadian Mineralogist, 44, 1341–1349.CrossRefGoogle Scholar
Yefimov, A.F., Dusmatov, V.D., Ganzeyev, A.A. and Katayeva, Z.T (1971) Cesium kupletskite, a new mineral. Doklady of the Academy of Sciences U.S.S.R., Earth Sciences, 197, 140–143.Google Scholar