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Figure 2: Twinning in feldspars.
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albite twin

crystallography

Learn about this topic in these articles:

feldspar minerals

  • Figure 1: Schematic diagram showing ordered (left) and disordered (right) arrays within a structure having two kinds of sites (type 1 and type 2) and two types of occupants (x atoms and y atoms). In the ordered structure all x atoms are distributed uniformly in the spaces between the y atoms, whereas in the disordered structure no regular arrangement obtains.
    In feldspar: Crystal structure

    …twinning—those designated Carlsbad twinning and albite twinning—are shown in the figure. Carlsbad twinning occurs in both monoclinic and triclinic feldspars; albite twinning occurs only in triclinic feldspars. Albite twinning, which is typically polysynthetic (i.e., multiple or repeated), can be observed as a set of parallel lines on certain crystal or…

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