Formula: Ca5(SiO4)2SO4
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.630, β = 1.637, γ = 1.640
Bireflectance/Birefringence δ: 0.010
2V angle:
Dispersion: r > v
Optical orientation:
Optical axial plane:
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