Formula: Ca8Mg(SiO4)4Cl2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Isotropic
Optical sign: n = 1.67
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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