The crystal structure of seidozerite was refined (a Siemens P4 diffractometer, Mo
K
α radiation, 1180 independent reflections, anisotropic refinement,
R = 0.053). The monoclinic unit-cell parameters are
a = 5.627(1) Å,
b = 7.134(1) Å,
c = 18.590(4) Å, β = 102.68(1)°, sp. gr.
P2/
c,
Z = 4. The structural formula, Na
1.6Ca
0.275Mn
0.425Ti
0.575Zr
0.925[Si
2O
7]OF, agrees well with the results of the electron probe analysis. Seidozerite is demonstrated to belong to the meroplesiotype
polysomatic series including the structures of more than 30 titano-and zirconosilicates.
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Translated from Kristallografiya, Vol. 47, No. 2, 2002, pp. 232–236.
Original Russian Text Copyright © 2002 by Pushcharovski
$\overset{\lower0.5em\hbox{$\overset{\lower0.5em\hbox{
, Pasero, Merlino, Vladykin, Zubkova, Gobechiya.