Formula: Pb8Mn(Si2O7)3
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: uniaxial
Optical sign: -
Refractive indices: w = 2.033-2.07, e = 2.015-2.05
Birefringence δ: 0.018-0.02
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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