Formula: Mn9Zn6Sb2Si4O28
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.864, β = 1.895, γ = 1.905
Bireflectance/Birefringence δ: 0.041
2V angle: 58° (calculated), 52° (measured)
Dispersion: r > v
Optical orientation:
Optical axial plane:
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