Formula: Na6Mg(SO4)4
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.4880, β = 1.489, γ = 1.489
Bireflectance/Birefringence δ: 0.001
2V angle: 0° (calculated), 84° (measured)
Dispersion: Weak, r < v
Optical orientation:
Optical axial plane:
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