Formula: (Mg,Ca)Nb4O11·~10H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.725, β = 1.830, γ = 1.845
Bireflectance/Birefringence δ: 0.120
2V angle: 38° (calculated), 39° (measured)
Dispersion: None
Optical orientation:
Optical axial plane:
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