Formula: 6Fe0.9S.5(Mg,Fe)(OH)2
Reflected/transmitted colour:
Pleochroism: Strong, from yellowish brown to yellowish gray
Optical isotropy/anisotropy: Strong anisotropic, pinkish cream to gray
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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