Formula: Ca3Al2Si3O12
Reflected/transmitted colour: colourless, very light reddish brown
Pleochroism:
Optical isotropy/anisotropy: isotropic
Optical sign:
Refractive indices: n = 1.734
Birefringence δ:
2V angle:
Dispersion: weak
Optical orientation:
Optical axial plane:
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