Formula: Pb4FeSb6S14
Reflected/transmitted colour: polished section gray-black
Pleochroism: distinct
Optical isotropy/anisotropy: polished section strong anisotropic, gray, tan, brown, light blue, dark blue, basal sections are nearly isotropic
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section strong in both air and oil; //α dark yellow-green or olive, //β grayish yellow-green, //γ bright white with slight yellow-green tint
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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