Twinning of aragonite - the crystallographic orbit and sectional layer group approach

Acta Crystallographica. Section A, Foundations and Advances
Mohamed Amine MarzoukiMassimo Nespolo

Abstract

The occurrence frequency of the {110} twin in aragonite is explained by the existence of an important substructure (60% of the atoms) which crosses the composition surface with only minor perturbation (about 0.2 Å) and constitutes a common atomic network facilitating the formation of the twin. The existence of such a common substructure is shown by the C2/c pseudo-eigensymmetry of the crystallographic orbits, which contains restoration operations whose linear part coincides with the twin operation. Furthermore, the local analysis of the composition surface in the aragonite structure shows that the structure is built from slices which are fixed by the twin operation, confirming and reinforcing the crystallographic orbit analysis of the structural continuity across the composition surface.

References

Dec 24, 2003·Acta Crystallographica. Section A, Foundations of Crystallography·Massimo Nespolo, Giovanni Ferraris
Mar 18, 2005·Acta Crystallographica. Section B, Structural Science·E N CaspiE Zolotoyabko
Aug 24, 2006·Acta Crystallographica. Section A, Foundations of Crystallography·Massimo Nespolo, Giovanni Ferraris
May 15, 2015·Acta Crystallographica. Section A, Foundations and Advances·Mohamed Amine MarzoukiMassimo Nespolo

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