Минералогия (Sep 2017)

DINGDAOHENGITE-(Ce) FROM VISHNEVYE MOUNTAINS (SOUTHERN URALS, RUSSIA)

  • A.V. Kasatkin,
  • V.A. Popov,
  • A.M. Kuznetsov,
  • F. Nestola

Journal volume & issue
Vol. 3, no. 3
pp. 3 – 8

Abstract

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Dingdaohengite-(Ce) was found in assemblage with albite, aegirine, ferroferriwinchite, calcite, pyrite and molybdenite in the central part of the syenite pegmatite of the vein № 125 in Vishnevye mountains in the Southern Urals (the second finding in Russia). The crystals are subisometric, with sides of pinacoidal {100}, {001}, {201}, {20 1}, {301}, {203} and rhombic prisms {110}, {111}. Parameters of the monoclinic unit cell: a = 13.59(3) Å, b = 5.779(6) Å, c = 11.113(18) Å, β = 100.42(19)°, V = 858(3)Å3 ; empirical formula is (Ce1.77La1.34Nd0.26Pr0.06Ca0.48Mn0.05Th0.04) Σ4.00(Fe2+ 0.61Mn0.39)Σ1.00 (Ti 0.85Fe3+ 0.71Fe2+ 0.24Mg0.16)Σ1.96 (Ti1.86Nb0.14)Σ2.00 (Si4O21.99).

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