Optic Character
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Definition
The fundamental optical classification of a gemstone as either isotropic (singly refractive) or anisotropic (doubly refractive), and if anisotropic, whether it is uniaxial or biaxial.
Detailed Explanation
A classificação óptica fundamental de uma gema como isotrópica (simplesmente refratora) ou anisotrópica (duplamente refratora) e, se anisotrópica, se é uniaxial ou biaxial.