Formula: K2SO4
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.4935, β = 1.4947, γ = 1.4973
Bireflectance/Birefringence δ: 0.0038
2V angle: 70° (calculated), 67° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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