Formula: Ca3GdY4Si8O20(CO3)6(OH) . 2H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.586-1.589, β = 1.614-1.616, γ = 1.621-1.626
Bireflectance/Birefringence δ: 0.035-0.037
2V angle: 52-60° (calculated), 61° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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