Formula: (Cu,Ni,Co,Fe)S2
Reflected/transmitted colour: opaque, polished section idiomorphic crystals reddish violet tinge, similar to that of ilmenite, nodular specimens are more light bluish gray to violet-gray
Pleochroism:
Optical isotropy/anisotropy: polished section isotropic, a very weak anomalous anisotropy may be visible in idiomorphic villamaninite
Optical sign:
Refractive indices:
Birefringence δ/bireflectance:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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