Formula: Pb(Pb,Ca)(Al,Fe,Mg)2(Si,Al)4O10(OH)2(CO3)2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: ?
Refractive indices: α = 1.693, γ = 1.738
Bireflectance/Birefringence δ: 0.045
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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