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Iron-rich bustamite from Broken Hill, Australia: The crystal structure and cation-ordering features

  • Structure of Inorganic Compounds
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Abstract

A specimen of iron-rich bustamite from the Broken Hill deposit (Australia) has been studied by single-crystal X-ray diffraction and by Mössbauer and IR spectroscopy. The triclinic unit-cell parameters are as follows: a = 7.1301(4) Å, b = 7.6940(3) Å, c = 7.7345(4) Å, α = 79.352(4)°, β = 62.951(6)°, γ = 76.149(3)°, V = 365.49(3) Å3, sp. gr. \(P\bar 1\). The structure is solved by direct methods and refined to R = 5.22% based on 7298 reflections with |F| > 4σ(F). The mineral under study is similar in composition and structure to the Fe-rich bustamite described earlier. It is found that all iron atoms are in the divalent state and occupy the M1 and M3 sites in a ratio of 33: 67. The idealized formula of iron-rich bustamite from Broken Hill (Z = 1) is Mn2Ca2(Fe,Mn)Ca[Si3O9]2.

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Correspondence to S. M. Aksenov.

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Original Russian Text © S.M. Aksenov, N.V. Shipalkina, R.K. Rastsvetaeva, V.S. Rusakov, I.V. Pekov, N.V. Chukanov, V.O. Yapaskurt, 2015, published in Kristallografiya, 2015, Vol. 60, No. 3, pp. 385–390.

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Aksenov, S.M., Shipalkina, N.V., Rastsvetaeva, R.K. et al. Iron-rich bustamite from Broken Hill, Australia: The crystal structure and cation-ordering features. Crystallogr. Rep. 60, 340–345 (2015). https://doi.org/10.1134/S1063774515030037

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