X-ray study of the rhodonite-bustamite transformation
Abstract
Crystals of natural rhodonite from the Nodatamagawa Mine, Japan, (Ca0.181 Mn0.754Fe0.011 Mg0.054 SiO3, a = 6.717, b = 7.664, c = 12.245 Å, α = 111.35°, β = 85.13°, γ = 94.24°), were transformed into a structure of the bustamite type after they were heated in an evacuated tube at 1200° C for 48 h. In the transformation, the chemical composition of the original rhodonite was found to be unchanged. The Mn content of the transformed product, which is here denoted inverted bustamite, accordingly exceeds the Mn-rich compositional limit, Mn0.67 Ca0.33 SiO3, which had been established for the natural bustamite solid solution based on chemical analyses of 8 bustamite specimens coexisting with rhodonites. Inverted bustamite has cell dimensions a = 7.605, b = 7.102, c = 13.568 Å, α = 89.95°, β = 94.39°, γ = 103.53° space group A[unk], and Z = 12. The result of structural analysis (R = 4.1 %) has revealed that the Mn content of the M(2) site amounts to 74(1) % and that of M(4) to 47(1) %. The structural features characteristic of inverted bustamite are explainable in terms of the high Mn contents in these cation sites which are unusual for the bustamite structure type. A possible structural mechanism of the phase transformation has been suggested.
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- Crystal structure of Bis(thiourea) lead(II) nitrate Pb(NO3)2 · [SC(NH2)2]2*
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