Formula: Ni(OH)2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: +
Refractive indices: w=1.759-1.760, e=1.759-1.760
Bireflectance/Birefringence δ: very weak to 0.000
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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