Formula: 2CaSO3 . H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.596, β = 1.600, γ = 1.634
Bireflectance/Birefringence δ: 0.038
2V angle: 40° (calculated), 38° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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