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antiperthite
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antiperthite

mineral

Learn about this topic in these articles:

formation

  • 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: Chemical composition

    …over the plagioclase constituent, whereas antiperthite is the name given to intimate mixtures in which the plagioclase constituent is predominant. Perthites are common, whereas antiperthites are relatively rare.

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