Formula: Mg7(Ca,Mg)(Fe,Al)2(SO4)2(OH)18.18H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.482, ω = 1.493
Bireflectance/Birefringence δ: 0.011
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
| Back to Alphabetical lis | 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 |