Formula: Ca4MnFe4(PO4)6(OH)4.12H2O
Reflected/transmitted colour:
Pleochroism: Colourless (x), very pale green (y), pale green (z)
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.598, β = 1.601, γ = 1.602
Bireflectance/Birefringence δ: 0.004
2V angle: 58° (calculated), 83° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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