Formula: Mn5SnB2Si5O20
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.696, β = 1.711, γ = 1.715
Bireflectance/Birefringence δ: 0.019
2V angle: 54.3° (calculated), 57° (measured)
Dispersion: Strong, r > v
Optical orientation:
Optical axial plane:
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