Formula: Cu6Fe2SnS8
Reflected/transmitted colour: opaque, polished section brownish orange
Pleochroism: polished section strong, orange to brown with a slight orange tint
Optical isotropy/anisotropy: polished section very strong anisotropic, bright straw yellow to bright royal blue and to dark gray-blue near extinction
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section strong, orange to brown with a slight orange tint, in the latter position it is almost identical to hexastannite
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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