Formula: Amorphous Al2O3.1.3-2.0(SiO2).2.5-3(H2O)
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: isotropic
Optical sign:
Refractive indices: n = 1.468-1.512 (air-dried)
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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