Formula: CaMg(AsO4)F
Reflected/transmitted colour: Colourless to pale green
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.640, β = 1.660, γ = 1.675
Bireflectance/Birefringence δ: 0.035
2V angle: 80° (calculated), 82°44' (measured)
Dispersion: Slight, r < v
Optical orientation: Z = b, X ⋀ c = ~ 30°
Optical axial plane:
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