Formula: Pb3(Sb,As)O3(OH)Cl2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: n.d.
Refractive indices: n.d.
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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