Formula: (Ni,Mg)3Si4O10(OH)2
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.600, β = 1.652, γ =1.655
Bireflectance/Birefringence δ: 0.055
2V angle: 26° (calculated), 27° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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