Formula: CdS
Reflected/transmitted colour: nearly opaque, polished section gray but often very light lemon-yellow to red-brown and blood-red due to abundant internal reflections
Pleochroism: weak
Optical isotropy/anisotropy: uniaxial, polished section anisotropy not perceptible
Optical sign: + (red to blue-green), - (blue-green to blue), isotropic at 523 nm
Refractive indices:
Birefringence δ/bireflectance: polished section not perceptible
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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