Formula: SrSO4
Reflected/transmitted colour: colourless
Pleochroism: blue crystals weakly pleochroic: indigo, lavender-blue, blue-green, violet, absorption γ > β > α
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.621-1.622, β = 1.623-1.624, γ = 1.630-1.631
Birefringence δ: ~ 0.009
2Vγ angle: 50°
Dispersion: r < v, moderate
Optical orientation: α = z, β = y, γ = x
Optical axial plane: (010)
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