Formula: (Mg,Mn)9Zn4(SO4)2(OH)22.8H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.570, β = 1.584, γ = 1.585
Bireflectance/Birefringence δ: 0.015
2V angle: 28° (calculated), ~ 40° (measured)
Dispersion:
Optical orientation: X = b
Optical axial plane:
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