Abstract
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): AK0.04M(4) (Ca1.92Na0.08) C[M(1)(Mg1.78Fe0.224+) M(2)(Mg1.62Fe0.263+Al0.12) M(3)(Mg0.64Fe0.322+Mn0.04)] [T(Si7.44Al0.56)O22] W(OH)2. The monoclinic unit cell parameters are a = 9.855(1) A, b = 18.084(1) A, c = 5.289(1) A, β = 104.853(2)°; V = 911.1(2) A3; 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 > 2σ(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 Мg among C2+ cations and Fe3+ among C3+ cations.
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