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Crystal structure of magnesio-ferri-hornblendite □Ca2(Mg4Fe3+)[(Si7Al)O22](OH)2 as a potentially new mineral of the amphibole supergroup

Crystal structure of magnesio-ferri-hornblendite □Ca2(Mg4Fe3+)[(Si7Al)O22](OH)2 as a potentially... 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 K0.04 M(4) (Ca1.92Na0.08) C [ M(1)(Mg1.78Fe 0.22 4+ ) M(2)(Mg1.62Fe 0.26 3+ Al0.12) M(3)(Mg0.64Fe 0.32 2+ 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 C 2+ cations and Fe3+ among C 3+ cations. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Doklady Chemistry Springer Journals

Crystal structure of magnesio-ferri-hornblendite □Ca2(Mg4Fe3+)[(Si7Al)O22](OH)2 as a potentially new mineral of the amphibole supergroup

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References (7)

Publisher
Springer Journals
Copyright
Copyright © 2016 by Pleiades Publishing, Ltd.
Subject
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
ISSN
0012-5008
eISSN
1608-3113
DOI
10.1134/S0012500816090032
Publisher site
See Article on Publisher Site

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): A K0.04 M(4) (Ca1.92Na0.08) C [ M(1)(Mg1.78Fe 0.22 4+ ) M(2)(Mg1.62Fe 0.26 3+ Al0.12) M(3)(Mg0.64Fe 0.32 2+ 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 C 2+ cations and Fe3+ among C 3+ cations.

Journal

Doklady ChemistrySpringer Journals

Published: Oct 2, 2016

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