Towards a structural theory of twinning

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Table of contents

Chapter I. Introduction
Chapter II. Description and analysis of twins
II.1. Basic definitions and classifications of twins
II.2. The twinning parameters and the reticular classification
II.3. Friedelian and hybrid twins
II.4. Towards a structural theory of twinning
Crystallographic orbit approach
Layer group approach
Chapter III. Summaries of articles
III.1. Summary of the article ‘Analysis of the structural continuity in twinned crystals in terms of pseudo-eigensymmetry of crystallographic orbits’
III.2. Summary of the article ‘The staurolite enigma solved’
III.3. Summary of the article ‘Twinning of aragonite – the crystallographic orbit and sectional
layer group approach’
Chapter IV. Discussion
IV.1. The restoration percentage and twinning frequency
IV.2. Examples of studied twins with a high restoration percentage
IV.3. Example of a « negative » twin case
IV.4. « Necessary » vs. « Sufficient » conditions
IV.5. Conclusion and outlook
Chapter V. References