Formula: BaSi2O5·4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.537, β = 1.538, γ = 1.541
Bireflectance/Birefringence δ: 0.004
2V angle: 62.2° (calculated), 59.2° (measured)
Dispersion: Moderate r < v
Optical orientation:
Optical axial plane:
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