Formula: In(OH)3
Reflected/transmitted colour: light yellow, polished section dark gray
Pleochroism:
Optical isotropy/anisotropy: isotropic, polished section isotropic
Optical sign:
Refractive indices: n = 1.725
Birefringence δ/bireflectance:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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