Axes

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  1. Crystallographic directions through a crystal; used as lines of reference. Hurlbut
  2. Reference coordinates a, b, c, in crystallography, crystallographic axes.
  3. Directions of apparent isotropy in anisotropic crystals, optic axes.
  4. Elements of rotational symmetry, symmetry axes.
  5. In ellipsoids representing the Fletcher indicatrix of refractive indices, semiaxes represent optic directions. Singular: axis. Also called optic axes.
    Source: Dictionary of Mining, Mineral, and Related Terms


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