Anisotropic
Term used in gemology for double refraction.
Artificial Stone
A man-made, imitation or synthetic gem.
Anisotropic media
In an anisotropic medium, such as a crystal, the polarisation field P is not necessarily aligned with the electric field of the light E.
Anisotropic... when applied to crystals it is the display of unequal physical properties in different directions. An example would be a mineral which has a different hardness when tested in different directions.
Anisotropic
The term for cyrystals where the optical poperty vary with the direction. Like in the cubic system and show double refraction.
Anisotropic minerals that have a single optic axis and crystallize in the hexagonal and tetragonal crystal systems are called "uniaxial minerals.
Anisotropic vs. isotropic (S vs. R or G), u.v. fluorescence and inclusions (S vs. G)
Ruby dichroic, spinel and garnet aren't.
BLUE STONES: Topaz vs. Sapphire vs. Aquamarine vs. Spinel vs. Zircon ...
All transparent substances can be classified as either isotropic or anisotropic. Isotropic includes amorphous mineraloids and minerals in the isometric crystal system.
anisotropic Lacking consistent hardness on all surfaces. For example, the hardness of Kyanite on the Mohs scale is between 6 and 7 lengthwise, and between 4 and 4½ crosswise anthracite A hard, ...
If the stone darkens evenly at every 90 degree interval, the stone is said to be doubly refractive or anisotropic.
If the stone appears light throughout the rotation, it is said to be microcrystalline or crypto crystalline aggregate.
If the velocity of light varies with direction, the stone is doubly refractive, or anisotropic, and has two refractive indices. In anisotropic materials, light is separated into two polarized components, the ordinary ray and the extraordinary ray.
Due to their anisotropic character between crossed polars and prominent basal cleavage, they are most likely mica. Other platelike inclusions consist of irregular distorted shingles which are opaque and black or slightly gold in color.
Being singly refractive, the opposite of doubly refractive (bi-refringent or anisotropic). Diamond is normally isotropic, but can be bi-refringent because of inclusions or internal strain.
Israel ...
singly refractive Diamond is singly refractive since the light traveling through it has a consistent refractive index regardless of the direction it enters. Moissanite, the popular diamond imitation, is doubly refractive due to its anisotropic ...
 See also: Crystal, Rough, Mineral, Diamond, Stone
  
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