Twinned Crystals

A crystal twin adds a symmetry element that is not present in either half of the twin. Most twins can be described by a rotation of 180 degrees about an axis. (Although a mirror plane might seem to be an exception, a mirror plane is a rotation of 180 degrees plus a center of symmetry.) The 180-degre...

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Bibliographic Details
Published inNanoscale p. 63
Main Authors Deffeyes, Kenneth S, Deffeyes, Stephen E
Format Book Chapter
LanguageEnglish
Published United States The MIT Press 30.09.2011
MIT Press
Subjects
Anions
Atomic physics
Atoms
Axes of rotation
Biogeography
Chalcogens
Chemical elements
Chemistry
Classical mechanics
Condensed matter physics
Crystal morphology
Crystal structure
Crystal twinning
Crystallography
Crystals
Cubic crystals
Earth sciences
Electric charge
Electricity
Electromagnetism
Fluorite
Fundamental forces
Geology
Gyration
Inorganic sulfides
Ions
Kinetics
Mechanics
Microphysics
Mineralogy
Minerals
Molecular biology
Nanotechnology
Physical Sciences
Physics
Pyrites
Rotation
Spinel
Sulfides
Sulfur
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Summary:A crystal twin adds a symmetry element that is not present in either half of the twin. Most twins can be described by a rotation of 180 degrees about an axis. (Although a mirror plane might seem to be an exception, a mirror plane is a rotation of 180 degrees plus a center of symmetry.) The 180-degree axis of rotation is shown in the illustration for each of the three twinned crystals. Twins are described in several categories. A contact twin has an obvious planar boundary between the twinned segments, as in the spinel twin. In contrast, the fluorite and
ISBN:9780262516716
0262516713
DOI:10.7551/mitpress/8166.003.0024