Greenockite

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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