Formula: NaAl8V10O38.30H2O
Reflected/transmitted colour: Yellow
Pleochroism: Slight, in shades of yellow
Optical isotropy/anisotropy: Biaxial
Optical sign: ?
Refractive indices: α = 1.71, γ = 1.735
Bireflectance/Birefringence δ: 0.025
2V angle:
Dispersion:
Optical orientation: Extinction parallel, elongation negative
Optical axial plane:
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