Formula: Bi2(Te,Se,S)3
Reflected/transmitted colour:
Pleochroism: Pinkish creamy white to white with creamy tint
Optical isotropy/anisotropy: Strong, bluish gray to brownish gray to gray
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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