Umohoite

Formula: (UO2)MoO4.4H2O

Reflected/transmitted colour:

Pleochroism: Dark blue (X), light blue (Y), olive green (Z)

Optical isotropy/anisotropy: Biaxial

Optical sign: -

Refractive indices: α = 1.660, β = 1.831, γ = 1.915

Bireflectance/Birefringence δ: 0.255

2V angle: 64° (calculated), 65° (measured)

Dispersion: r > v

Optical orientation: Y = b, X Ù c 90°5', Z a

Optical axial plane:

 

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