Formula: USi7O17
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: - (probable)
Refractive indices: α = 1.570, γ = 1.584
Bireflectance/Birefringence δ: 0.014
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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