Formula: CaSO4
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.569-1.574, β = 1.573-1.579, γ = 1.609-1.618
Birefringence δ: ~ 0.04
2Vγ angle: 42-44°
Dispersion: r < v
Optical orientation: α = y, β = x, γ = z
Optical axial plane: (100)
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