Formula: Bi
Reflected/transmitted colour: opaque, polished section white to creamy white, quickly tarnishes to pinkish cream, then turning slowly brownish
Pleochroism:
Optical isotropy/anisotropy: distinct to strong anisotropy
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: weak but distinct anisotropy, especially in oil, creamy white to creamy white with a gray tint. More distinct in freshly polished sections creamy white to pinkish white
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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