Formula: HK(UO2)SiO4 . 1.5H2O
Reflected/transmitted colour: colourless to yellow
Pleochroism: weak, a = colourless, b = g = yellow, anomalous blue interference colours
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: a = 1.668-1.670, b = 1.695-1.696, g = 1.698-1.703
Birefringence δ: 0.028-0.035
2V angle: large
Dispersion:
Optical orientation:
Optical axial plane:
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