Formula: Hg5CrO6
Reflected/transmitted colour: RL greenish white to darker lilac gray with deep red internal reflections
Pleochroism: Strong
Optical isotropy/anisotropy: Biaxial, RL strong, purple, dark blue, bottle green, bottle blue, turquoise blue, dull greenish bleu
Optical sign: ?
Refractive indices: a = 2.44-2.52, g = 2.7-2.86
Bireflectance/Birefringence δ: 0.260-0.340, RL moderate
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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