Formula: Pb2Ni3S2
Reflected/transmitted colour: opaque, polished section white with a slight creamy tint
Pleochroism: polished section distinct
Optical isotropy/anisotropy: polished section very strong, gray blue to yellow-brown
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section strong, ε similar to heazlewoodite, w much darker and bluish gray
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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