The ordering behaviour of reedmergnerite,NaBSi3O8 |
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| Authors: | R A Mason |
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| Institution: | 1. Dept. of Geology, The University, M13 9PL, Manchester, Great Britain
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| Abstract: | Reedmergnerite (NaBSi3O8) has been synthesised hydrothermally from gels containing 10 wt.% excess SiO2. The degree of B, Si order increases with time at constant temperature and pressure. Complete order is achieved in 250 h at 400° C, P fluid=1 kbar and in 700 h at 300° C, 1 kbar. Lower pressures and/ or low water contents greatly reduce the rate of ordering. The ordering behaviour of reedmergnerite is insensitive to the composition of the co-existing fluid and this contrasts with the behaviour of albite. It is suggested that ordering takes place by a process of solution and re-precipitation. |
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