Formula: (Zr,Ti)(SO4)2.4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.62, β = 1.644, γ = 1.674
Bireflectance/Birefringence δ: 0.054
2V angle: 86° (calculated), 75° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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