Formula: FeAsS
Reflected/transmitted colour: opaque, polished section white with faint yellowish tint
Pleochroism: weak, in white or bluish tint and faint reddish yellow
Optical isotropy/anisotropy: strong, red-violet
Optical sign:
Refractive indices:
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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