Formula: Pb3CaAl2Si10O24.3H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: e=1.648, w=1.692
Bireflectance/Birefringence δ: 0.044
2V angle:
Dispersion: Moderate, r < v
Optical orientation:
Optical axial plane:
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