Formula: Ca2(Mg,Co)(AsO4)2·2H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.694, β = 1.703, γ = 1.713
Bireflectance/Birefringence δ: 0.019
2V angle: 88° (calculated), 87° (measured)
Dispersion: r < v
Optical orientation:
Optical axial plane:
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