Formula: ZnCr2O4
Reflected/transmitted colour: RL brownish greay with rare brown internal reflections
Pleochroism:
Optical isotropy/anisotropy: Isotropic
Optical sign:
Refractive indices: n (calculated) = 2.3 from Gladstone-Dale relationship
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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