Formula: Cu8(Fe,Zn)3Sn2S12
Reflected/transmitted colour: RL pinkish brown
Pleochroism: RL distinct, pale salmon-brown to brown
Optical isotropy/anisotropy: RL strong, dark orange red to yellow-gray
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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