Formula: Na(Cu,Fe,Zn)2S2
Reflected/transmitted colour: orange, changing to rosy purple with time
Pleochroism: distinct, from light orange to dark gray with a lilac tint
Optical isotropy/anisotropy: strong anisotropy, from black to white
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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