Formula: Ni(OH)2-x(SO4,CO3)0.5x (x ~ 0.6)
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: ?
Refractive indices: α = 1.655, γ = 1.705
Bireflectance/Birefringence δ: 0.050
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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