Formula: (Co,Mg)Al2(SO4)4.22H2O
Reflected/transmitted colour:
Pleochroism: Weak, pink (x,y), darker pink (z)
Optical isotropy/anisotropy: Biaxial
Optical sign: ?
Refractive indices: α = 1.477, γ = 1.484
Bireflectance/Birefringence δ: 0.007
2V angle:
Dispersion: Z Ù extinction up to 12°
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 |