Formula: CaMnFe(PO4)2(OH).2H2O
Reflected/transmitted colour:
Pleochroism: Light yellow (x), light yellow (y), dark yellow (z)
Optical isotropy/anisotropy: Biaxial
Optical sign: - or +
Refractive indices: a=1.637, b=1.664, g=1.692
Bireflectance/Birefringence δ: 0.055
2V angle: 45° (calculated)
Dispersion:
Optical orientation: X = b, Y = a, Z = c
Optical axial plane:
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