Formula: MgSO4 . H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.520, β = 1.533, γ = 1.584
Bireflectance/Birefringence δ: 0.064
2V angle: 56° (calculated), 55° (measured)
Dispersion: Moderate, r > v
Optical orientation:
Optical axial plane:
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