Formula: Ni6Al2((OH)16(CO3,OH).4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.598, ω = 1.605
Bireflectance/Birefringence δ: 0.007
2V angle: Small, anomalous (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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