Reference:
▪ Zarubina, E.S., Aksenov, S.M., Chukanov, N.V., Rastsvetaeva, R.K. (2016): Crystal Structure of Magnesio-Ferri-Hornblendite □Ca2(Mg4Fe3+)[(Si7Al)O22](OH)2 as a Potentially New Mineral of the Amphibole Supergroup. Doklady Chemistry, 470, 245–251.
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): AK (Ca1.92Na0.08) C[M(1)(Mg1.78Fe ) M(2)(Mg1.62Fe Al0.12) M(3)(Mg0.64Fe Mn0.04)][T(Si7.44Al0.56)O22] W(OH)2. The monoclinic unit cell parameters are a = 9.855(1) Å, b = 18.084(1) Å, c = 5.289(1) Å, β = 104.853(2)°; V = 911.1(2) Å3; 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.
NB: Correct name should be magnesio-ferri-horneblende.
▪ Zarubina, E.S., Aksenov, S.M., Chukanov, N.V., Rastsvetaeva, R.K. (2016): Crystal Structure of Magnesio-Ferri-Hornblendite □Ca2(Mg4Fe3+)[(Si7Al)O22](OH)2 as a Potentially New Mineral of the Amphibole Supergroup. Doklady Chemistry, 470, 245–251.
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): AK (Ca1.92Na0.08) C[M(1)(Mg1.78Fe ) M(2)(Mg1.62Fe Al0.12) M(3)(Mg0.64Fe Mn0.04)][T(Si7.44Al0.56)O22] W(OH)2. The monoclinic unit cell parameters are a = 9.855(1) Å, b = 18.084(1) Å, c = 5.289(1) Å, β = 104.853(2)°; V = 911.1(2) Å3; 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.
NB: Correct name should be magnesio-ferri-horneblende.