Tengchongite

Formula: Ca(UO2)6(MoO4)2O5.12H2O

Reflected/transmitted colour: Yellow

Pleochroism:

Optical isotropy/anisotropy: Biaxial

Optical sign: -

Refractive indices: α = 1.663, β = 1.76, γ = 1.762

Bireflectance/Birefringence δ: 0.099

2V angle: 16° (calculated), 16° (measured)

Dispersion:

Optical orientation: X = c

Optical axial plane:

 

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