Formula: Mg5Al12(PO4)8(OH)22.32H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign:
Refractive indices: α = 1.500
Birefringence δ: very low
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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