Formula: (Fe, Zn)Al6(PO4)4(OH)8.4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: n = ~1.63
Birefringence δ:
2V angle: nd
Dispersion:
Optical orientation:
Optical axial plane:
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