Formula: Ca4Al4Si4O6(OH)24.3H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial, rarely uniaxial (-)
Optical sign: -
Refractive indices: α = 1.531, β = 1.535, γ = 1.541
Bireflectance/Birefringence δ: 0.010
2V angle: 80° (calculated), 62° (measured)
Dispersion:
Optical orientation: X = c, Z Ù b = 16°
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 |