Formula: Ca4Fe2(PO4)4(OH)2.3H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.704, β = 1.715, γ = 1.724
Bireflectance/Birefringence δ: 0.020
2V angle: measured: 80° to 90°, calculated: 82°
Dispersion:
Optical orientation:
Optical axial plane:
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