Formula: (K,Na)3-x(Sb2O3)3(SbS3)(OH)x . (3+x)H2O (x= ~ 0.5)
Reflected/transmitted colour: orange
Pleochroism: weak, from orange to slightly orange brown
Optical isotropy/anisotropy: uniaxial
Optical sign: +
Refractive indices: > 1.74
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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