Formula: NaMg3V6(BO3)3Si6O18(OH)4
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.729, ω = 1.786
Bireflectance/Birefringence δ: 0.057
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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