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Crystallographic axes or axes of reference
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acetate acid acute bisectrix analyser anisotropic axes of optical bakelite basal biaxial crystal birefringence c-axis Canada balsam carborundum centre chemical cleavage consequently crossed polaroids crystal section crystalline crystallographic axes determination dispersion double refraction double variation etch exhibit extraordinary ray face glass slide GNOMONIC PROJECTION grains grinding hexagonal Holosymmetric Class identification illumination immersion impregnated index ellipsoid indicatrix indices of refraction interference colours interference figure isogyres isotropic liquid material metal method microscopic examination monoclinic normal optic axial angle optic axial plane optic axis optical characters optical properties optical symmetry ordinary ray orientation orthorhombic pinacoid plane polarized plate pleochroism polarized light polarizing microscope polaroids polished sections preparation prism produced rays vibrating reagent refractive index relative retardation rotation specimen spherical projection stage structure substance suitable technique tetragonal thickness thin section triclinic uniaxial crystals velocity of propagation velocity of transmission vertical vibrating parallel vibration directions wave front wavelength xylol