Formula: PbCuSbS3
Reflected/transmitted colour: opaque, polished section grayish white with a distinct blue or bluish green tint
Pleochroism: polished section very weak
Optical isotropy/anisotropy: polished section weak anisotropy in air, distinct in oil (especially when twinned), pale blue, greenish gray, brownish yellow, dark brown, purplish
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section; in air weak, only visible on grain boundaries and on twin lamellae, in oil distinct, white with a bluish green tint to white with an olive-green tint
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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