HYDRATED CO<sub>3</sub>-BEARING ANALOG OF MANGANOEUDIALYTE FROM ALKALINE PEGMATITES OF THE KONDER MASSIF, KHABAROVSK KRAY
Chemical composition, crystal structure and physical properties of a hydrated CO3-bearing analog of manganoeudialyte from alkaline pegmatites of the Konder massif, Khabarovsk Kray, Russia, have been studied. Chemical composition corresponds to the empirical formula: N[Na6.94H2O5.13(Y, REE)0.58*Pb0.31K0.28Ba0.08]13.32M1[Ca5.09Sr0.89]5.98M2[Mn1.523+Ti0.21 Mg0.04 Fe3+0.03 Al0.02]1.82M3(Si1.16Nb0.47)1.63M4(Si)0.50*Z[Zr3.04Hf0.03]3.07(Si3O9)2(Si9O27)2(CO3)0.28X[(H2O)4.45OH0.04Cl0.03]4.52. Infrared spectrum contain the following bands (s - strong band, sh - shoulder): 455s, 475s, 655, 740s, 925s, 977s, 1010s, 1145, 1420sh, 1504, 1650, 2970sh, 3240sh, 3480 cm 1. The crystal structure is refined in the space group R3m, a = 14.243(3), c = 30.371(6) A, V = 5336(2) A3, with R1 = 0.065 for 1393 independent reflections (|Fo| > 4<xF). The deficiency of sodium and chlorine, the presence of lead and barium, as well as a high degree of hydration of the mineral indicate natural ion exchange processes after crystallization, during the stage of hydrothermal alteration of aegirine-albite rocks of the Konder massif.