Formula: Bi3TeSe2
Reflected/transmitted colour:
Pleochroism: Gray to bluish gray
Optical isotropy/anisotropy: Moderate without any strong chromatic effects
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: Weak, noticeable in oil, yellowish white to gray
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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