ordering

mineralogy

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crystalline alloys

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

    …of particular interest is termed ordering (see figure). This phenomenon is indicative of the conditions under which the feldspar was formed and its subsequent thermal history. Ordering in feldspars is based on the distributional pattern of silicon and aluminum within the different tetrahedrons. It can be characterized as follows: silicon…

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