Formula: NiSeO3.2H2O
Reflected/transmitted colour: greenish to pink
Pleochroism: α pale green, β pale pink, γ pink
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.709, β = 1.752, γ = 1.787
Birefringence δ: 0.078
2V angle: measured: 85° , calculated: 82°
Dispersion: r < v, strong
Optical orientation: β = b, γ ^ c = -16°
Optical axial plane:
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