Formula: Na2SO4
Reflected/transmitted colour: Colourless
Pleochroism: None
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α= 1.464–1.471, β = 1.473–1.477, γ = 1.481–1.485
Bireflectance/Birefringence δ: 0.013
2V angle: 86° (calculated), 83° (measured)
Dispersion: Weak, r > v
Optical orientation: X = c, Y = b, Z = a
Optical axial plane:
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