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Derivation and Identification of Composite mica twins -Extension of The Minitnal Rhombus Approach

Abstract : The identification of composite twins of IM mica from the diffraction pattern is easily accomplished by analyzing the nuriiber and disposition of reflections along nine translationally independent reciprocal lattice rows parallel to c', which clefine a sort of asymmetric unit in reciprocal space, called minimal rhombus. Besldes IM, other polytypes frequently occur in micas and they often form twins too. The extension of the minimal rhombus approach to the other polytypes is in principle hindered by the appearance of weak reflections violating the so-called additional raj7ection co"ditions. Because of these weak reflections, in principle reciprocal lattice rows which are translationally equivalent in 1M are ne more such in other polytypes. However, these weak reflections can be recognized and distinguished from those characterizing the ideal structure ; by neglecting them, the minimal rhombus approach can be applied to all polytypes. A mathematical demonstration of the applicability of this method is here given.
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Massimo Nespolo. Derivation and Identification of Composite mica twins -Extension of The Minitnal Rhombus Approach. Journal of the Teikyo Heisei University, Teikyo Heisei University, 1999, 11 (1), pp.1-16. ⟨hal-01715602⟩



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