Formula: ThO2
Reflected/transmitted colour: In transmitted light, dark brown, reddish brown, greenish; gray with red-brown internal reflections in reflected light
Pleochroism:
Optical isotropy/anisotropy: Isotropic, may show weak anomalous anisotropism
Optical sign:
Refractive indices: n = 2.20-2.35
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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