Formula: MgB6O10·7H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.442, β = [1.500] , γ = 1.504
Birefringence δ: 0.062
2V angle: ~30°
Dispersion: r < v
Optical orientation: β = b, γ^c ≈ 45°
Optical axial plane:
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