Formula: Pb2As2S5
Reflected/transmitted colour: white, sometimes showing deep red internal reflections, dark red-brown in transmitted light
Pleochroism: very weak
Optical isotropy/anisotropy: strong, in brown-violet and dark green colours
Optical sign:
Refractive indices: n > 2.72
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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