Formula: CaAl2Si2O8
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.575, β = 1.583, γ = 1.588
Birefringence δ: 0.013
2V angle: 78°
Dispersion: variable
Optical orientation:
Optical axial plane:
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