Formula: Mg(C2O4) .2H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: a = 1.365, b = 1.530, g = 1.595
Bireflectance/Birefringence δ: 0.230
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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