Formula: ThAl(UO2)7(PO4)4O2(OH)5.15H2O
Reflected/transmitted colour: yellowish
Pleochroism: α very pale yellow, β = γ darker yellow
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.620, β = 1.661, γ = 1.665
Birefringence δ: 0.045
2V angle: measured: 34°, calculated: 34°
Dispersion: r < v, strong
Optical orientation: α ≈ a, γ ^ c = 15°
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 |