Ulrichite

Formula: CaCu(UO2)(PO4)2.4H2O

Reflected/transmitted colour:

Pleochroism:

Optical isotropy/anisotropy: Biaxial

Optical sign: -

Refractive indices: α = 1.622, γ = 1.634

Bireflectance/Birefringence δ: 0.012

2V angle:

Dispersion: Strong, r > v to r < v

Optical orientation: Parallel extinction, length slow

Optical axial plane:

 

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