Formula: NaF3S5 . 2H2O
Reflected/transmitted colour: pale brownish gray with a pink titn
Pleochroism: faint, from gray to pink
Optical isotropy/anisotropy: strong anisotropic, from gray to dull golden orange
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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