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Qu'est-ce (qui) est twinning$529944$ - définition
ALBITE VARIETY
Pericline twinning
Crystal twinning
.jpg?width=200 "Chrysoberyl showing cyclic twinning")
![electron micrograph]]).](https://commons.wikimedia.org/wiki/Special:FilePath/Twin2.jpg?width=200 "electron micrograph]]).")
.png?width=200 "Twin lattice (2D). The long horizontal red line is the composition plane where the two crystal segments join. The upper crystal lattice is the reflection of the lower crystal lattice. The red points are the shared crystal lattice points.")
.JPG?width=200 "30° twin of staurolite")
![Diagram of twinned crystals of [[albite]]. On the more perfect cleavage, which is parallel to the [[basal plane]] (P), is a system of fine striations, parallel to the second cleavage (M).](https://commons.wikimedia.org/wiki/Special:FilePath/Twinned crystals of Albite.png?width=200 "Diagram of twinned crystals of [[albite]]. On the more perfect cleavage, which is parallel to the [[basal plane]] (P), is a system of fine striations, parallel to the second cleavage (M).")
TWO SEPARATE CRYSTALS SHARING SOME OF THE SAME CRYSTAL LATTICE POINTS IN A SYMMETRICAL MANNER
Polysynthetic Twinning; Twin boundary; Multiple twin; Repeated twin; Multiple Twin; Repeated Twin; Penetration twin; Contact twin; Cyclic twin; Composition surface; Parallel growth; Polysynthetic twin; Composition Surface; Contact Twin; Cyclic Twin; Parallel Growth; Penetration Twin; Polysynthetic Twin; Twinning (crystallography); Twinned crystal; Crystal twin; Twin crystals; Twin formation; Polysynthetic twinning; Deformation twinning
Crystal twinning occurs when two or more adjacent crystals of the same mineral are oriented so that they share some of the same crystal lattice points in a symmetrical manner. The result is an intergrowth of two separate crystals that are tightly bonded to each other.
twinned
WIKIMEDIA DISAMBIGUATION PAGE
Twinned; Twinning (disambiguation)
a.
1.
Twin, born at the same birth.
2.
Paired.
twinned
WIKIMEDIA DISAMBIGUATION PAGE
Twinned; Twinning (disambiguation)
adjective (of a crystal) that is a composite consisting of two (or more) parts which are reversed in orientation with respect to each other.
Wikipédia
Pericline
- Pericline also refers to a doubly plunging anticline or syncline.
Pericline is a form of albite exhibiting elongate prismatic crystals.
Pericline twinning is a type of crystal twinning which show fine parallel twin laminae typically found in the alkali feldspars microcline. The twinning results from a structural transformation between high temperature and low temperature forms.
