Formula: VS4 (?)
Reflected/transmitted colour: opaque, polished section dark gray, varying with chemical composition and orientation
Pleochroism: strong
Optical isotropy/anisotropy: very strong anisotropy, straight extinction, in air no colour effects, in oil light white or gray to blue-green and brown
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: for longitudinal section very strong
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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