Formula: Cu2(Fe,Zn)GeS4
Reflected/transmitted colour: opaque, polished section blue-gray to gray
Pleochroism:
Optical isotropy/anisotropy: polished section weak anisotropic in air, distinct to strong in oil, gray-green and reddish tints
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section, not observable
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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