Formula: (Mn,Fe,Mg)Al2(PO4)2(OH)2·8H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.5665, β = 1.5740, γ = 1.5815
Bireflectance/Birefringence δ: 0.0150
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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