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Boron in magnesium minerals of the humite group |
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| Authors: | E I Gerasimova I V Pekov N N Kononkova M F Vigasina N V Chukanov E V Guseva |
| Institution: | 16227. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, Russia 26227. Faculty of Geology, Moscow State University, Moscow, Russia 36227. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Moscow, Russia |
| Abstract: | Based on microprobe analysis and IR-spectroscopy of a representative collection of magnesium minerals of the humite group (282 samples from 80 various geological-genetic occurrences all over the world), it was shown for the first time that these minerals typically concentrate trace boron (from 0.5 to 4.9 wt % B2O3 in 63 samples). The diagnostic bands of B-O stretching vibrations in IF-spectra of magnesium minerals of the humite group occur within the 1170–1190, 1262–1289, and 1306–1331 cm?1 ranges and are regularly shifted to the low frequencies in a norbergite-chondrodite-humite-clinohumite series. Boron isomorphically replaces silicon in tetrahedra, probably, by Pertsev’s scheme: Si4+ + O2? → B3+ + (F,OH)?. |
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