Formula: Pb2(Fe, Zn)(AsO4)2.H2O
Reflected/transmitted colour:
Pleochroism: Honey-yellow to bright yellow
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: n = 2.0-2.1
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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