Formula: Ni5(CO3)4(OH)2.4-5H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.630, γ = 1.640
Bireflectance/Birefringence δ: 0.010
2V angle: high (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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