Formula: Al3(PO4)2(OH,F)3.5H2O
Reflected/transmitted colour:
Pleochroism: Bluish green (x), pale yellow or colourless (y)
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.52-1.535, β = 1.526-1.543, γ = 1.545-1.561
Bireflectance/Birefringence δ: 0.025-0.026
2V angle: 60-70° (calculated), 72° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
| Back to Alphabetical list | Colour photos | Physical, chemical and crystallographic description | SEM images | TEM images | vibrational spectra description | IR spectra | Raman spectra | N-IR spectra | F-IR spectra | IES spectra |