Formula: TlFeS2
Reflected/transmitted colour: polished section creamy grayish white to rose
Pleochroism: Strong, grayish white to rose
Optical isotropy/anisotropy: polished section strong anisotropy with vivid interference colours, orange dominating, straight extinction
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: strong, distinct pink // fibers, grayish white with creamy tint perpendicular to fibers
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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