Formula: ZnO
Reflected/transmitted colour: deep red to yellow, polished section pinkish brown with abundant yellowish or red internal reflections
Pleochroism:
Optical isotropy/anisotropy: uniaxial, polished section anisotropy masked by internal reflections
Optical sign: +
Refractive indices: w = 2.013, ε = 2.029
Birefringence δ/bireflectance: ~ 0.016, polished section bireflectance masked by internal reflections
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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