Formula: Ca2SbMg4FeSi4Be2O20
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.81, β = 1.83
Bireflectance/Birefringence δ: > 0.02
2V angle: 45° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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