Crystal structure of hydrogen-bearing vuonnemite from the Lovozero alkaline massifстатья
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Аннотация:Hydrogen-bearing vuonnemite from the Shkatulka hyperagpaitic pegmatite (the Lovozero alkaline massif, Kola Peninsula) was studied by single-crystal X-ray diffraction. The triclinic unit-cell parameters are as follows: a = 5.4712(1) , b = 7.1626(1) , c = 14.3702(3) , alpha = 92.623(2)A degrees, beta = 95.135(1)A degrees, gamma = 90.440(1)A degrees, sp. gr. P1, R = 3.4%. The Na(+) cations and H(2)O molecules are ordered in sites between the packets. The water molecules are hydrogen bonded to the PO(4) tetrahedra.