Formula: Cu5Se4
Reflected/transmitted colour: opaque, polished section bluish gray
Pleochroism: distinct, light gray to blue-gray
Optical isotropy/anisotropy: strong, creamy white to dark blue
Optical sign:
Refractive indices:
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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