Jinshajiangite: structure, twinning and pseudosymmetry

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
Shiyun JinPingqiu Fu

Abstract

The crystal structure of jinshajiangite based on a sample from its original discovery location is studied using single-crystal X-ray diffraction and transmission electron microscopy methods. Jinshajiangite is a titanium silicate mineral with an ideal chemical formula of BaNaFe4Ti2(Si2O7)2O2(OH)2F. The structure of jinshajiangite is of P\bar 1 symmetry (triclinic system), with a = 8.7331 (2) Å, b = 8.7366 (2) Å, c = 11.0404 (3) Å, α = 81.477 (1)°, β = 110.184 (1)°, γ = 104.384 (1)° and V = 764.03 (3) Å3, instead of the previously proposed C\bar 1 cell [a = 10.7059 (5) Å, b = 13.7992 (7) Å, c = 20.760 (1) Å, α = 90.008 (1)°, β = 94.972 (1)°, γ = 89.984 (1)°, V = 3055.4 (4) Å3]. The basic topology of the new structure is similar to the previously proposed C\bar 1 structure, except there is only one type of titanium silicate and intermediate cation layer in the structure (instead of two types), which are all related by the translation along the c-axis. Even though there is a significant amount of Mn in the chemical composition, no obvious ordering between Fe and Mn is observed in the structure. All the mineral species of the perraultite-type structure (jinshajiangite, perraultite, surkhobite and bobshannonite) should have the same ...Continue Reading

References

Feb 18, 2004·Acta Crystallographica. Section A, Foundations of Crystallography·Gábor Oszlányi, András Süto
Dec 23, 2004·Acta Crystallographica. Section A, Foundations of Crystallography·Gábor Oszlányi, András Süto

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Citations

Aug 25, 2020·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Shiyun JinDane Morgan

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