Formula: (Fe,Mn)2(Nb,Ta)2WO10
Reflected/transmitted colour: RL yellowish white
Pleochroism:
Optical isotropy/anisotropy: RL weak
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: RL weak
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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