Formula: Ba2(Mn,Fe,Ti)Si2O6(O,OH,Cl,F)2.3H2O
Reflected/transmitted colour:
Pleochroism: Colourless (ε), orange yellow (ω)
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.672, ω = 1.683
Bireflectance/Birefringence δ: 0.011
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 |