Formula: AlPO4.2H2O
Reflected/transmitted colour: Typically pale green to colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.563, β = 1.588, γ = 1.594
Bireflectance/Birefringence δ: 0.031
2V angle: 50° (calculated), moderate (measured)
Dispersion: Weak, r < v
Optical orientation: X = a. Y = c, Z = b
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 |