Formula: CaSO4.2H2O
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.519-1.521, β = 1.523-1.526, γ = 1.529-1.531
Birefringence δ: 0.010
2Vγ angle: ~ 58°
Dispersion: r > v, strong
Optical orientation: α Λ z = 38°, β = y, γ Λ z = 52°
Optical axial plane: (010)
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