Formula: (Ca,Mn)(Mg,Fe,Mn)3(PO4)2(OH,F)2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.568, β = 1.597, γ = 1.600
Bireflectance/Birefringence δ: 0.032
2V angle: 34° (calculated), 33° (measured)
Dispersion:
Optical orientation: X = c, Y = b, Z = a
Optical axial plane:
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