Formula: K2Mg(SO4)2.6H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.461, β = 1.463, γ = 1.476
Bireflectance/Birefringence δ: 0.015
2V angle: 46° (calculated), 47°5' (measured)
Dispersion: Weak, r > v
Optical orientation: Y = b, X Ù a = -1
Optical axial plane:
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