Cation distribution in the structure of titanium-containing ludwigite |
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| Authors: | A A Brovkin I V Rozhdestvenskaya E A Rykova |
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| Institution: | (1) Fedorovskii All-Russia Institute of Mineral Resources (VIMS), Staromonetnyi per. 29, Moscow, 109017, Russia;(2) Faculty of Geology, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199164, Russia;(3) Faculty of Physics, Moscow State University, Vorob'evy gory, Moscow, 119899, Russia |
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| Abstract: | The crystal structure of natural titanium-containing ludwigite has been refined. The unit-cell parameters are a = 9.260 ± 0.002 Å, b = 12.294± 0.002 Å, c = 3.0236± 0.0005 Å, sp. gr. Pbam, and R = 0.0288. The observed cation distribution over the M1-M4 positions corresponds to the structural formula (Mg0.5)(Mg1.0)(Mg0.338Fe 0.162 2+ )(Fe 0.47 3+ Ti 0.21 4+ Mg 0.15 2+ Al 0.10 3+ Fe 0.07 2+ (BO3)O2. Highly charged titanium ions in the M4 position are balanced mainly with magnesium and not with divalent iron ions. |
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