Formula: Na4Mn5Si10O24(OH)6.H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.535, ω = 1.565
Bireflectance/Birefringence δ: 0.030
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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