Formula: Pb4 (Mn, Fe) Sb6 S14
Reflected/transmitted colour: opaque, polished section white with a greenish tint, with rare dull red internal reflections
Pleochroism: weak
Optical isotropy/anisotropy: strong with tints of brown and blue
Optical sign:
Refractive indices:
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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