Formula: Ca2(Al2SiO7)
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: uniaxial
Optical sign: -
Refractive indices: w = 1.669, ε = 1.658
Birefringence δ: 0.011
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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