Formula: V1-xS.n(Mg,Al)(OH)2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: RL strong, orange-red with weak lilac tint in isotropic sections, red-lilac to pinkish dark gray.
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
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 |