Formula: CuFeO2
Reflected/transmitted colour: opaque, polished section light brownish rose
Pleochroism: distinct, w light golden brown, ε rose-brown
Optical isotropy/anisotropy: uniaxial, polished section very distinct to strong anisotropic, 45° bluish gray, straight extinction, basal sections appear isotropic
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section very distinct, in air w yellowish rose-brown to creamy brown, ε rose-brown, in oil w dull pinkish gray to yellowish gray, ε much darker, cacao-brown to pinkish brown-gray
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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