Formula: Th(SiO4)1-x(OH)4x
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Isotropic (anomalous)
Optical sign:
Refractive indices: n = 1.54-1.64
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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