Crystal structure of magnesio-ferri-hornblendite a-Ca-2(Mg4Fe3+)[(Si7Al)O-22](OH)(2) as a potentially new mineral of the amphibole supergroupстатья
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Аннотация:A sample of magnesio-ferri-hornblendite, a potential new mineral of the amphibole supergroup, was studied by X-ray diffraction and IR spectroscopy. The crystal chemical formula is (Z = 2): (A) K-0.04 (M(4)) (Ca1.92Na0.08) (C) [ (M(1))(Mg1.78Fe (0.22) (4+) ) (M(2))(Mg1.62Fe (0.26) (3+) Al-0.12) (M(3))(Mg0.64Fe (0.32) (2+) Mn-0.04)] [ (T) (Si7.44Al0.56)O-22] (W) (OH)(2). The monoclinic unit cell parameters are a = 9.855(1) , b = 18.084(1) , c = 5.289(1) , beta = 104.853(2)A degrees; V = 911.1(2) (3); space group C2/m; Z = 2. The crystal structure was refined to R = 2.82% in the anisotropic approximation for atomic displacement parameters using 1166 reflections with I > 2 sigma(I). The magnesio-ferri-hornblendite structure is generally similar to the structures of other monoclinic calcium amphiboles, and its key distinctive features are the predominance of Deg among C (2+) cations and Fe3+ among C (3+) cations.