Formula: (Mg,Fe)2(PO4)F
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.568-1.588, β = 1.572-1.589, γ = 1.582-1.598
Bireflectance/Birefringence δ: 0.010-0.014
2V angle: 38-66° (calculated), 25-35° (measured)
Dispersion: Weak, r < v
Optical orientation:
Optical axial plane:
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