Formula: MgAl(SO4)2F.18H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.424-1.425, β = 1.436, γ = 1.437-1.438
Bireflectance/Birefringence δ: 0.014
2V angle: 44° (calculated), 48° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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