Formula: Ba4Ca6(Si,Al)20O39(OH)2(SO4)3.nH2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.589, ω = 1.596
Bireflectance/Birefringence δ: 0.007
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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