Formula: Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2.8H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.580, β = 1.585, γ = 1.590 (CaFeMg), α = 1.580, β = 1.584, γ = 1.591 (CaMnMg), α = 1.580, β = 1.584-1.585, γ = 1.590-1.591 (MnFeMg)
Bireflectance/Birefringence δ: 0.010 (CaFeMg), 0.011 (CaMnMg), 0.010-0.011 (MnFeMg)
2V angle: 88° (calculated), 40-50° (measured) (CaFeMg), 76° (calculated), 74-81° (measured) (CaMnMg)
Dispersion:
Optical orientation:
Optical axial plane:
| Back to Alphabetical list | Colour photos: whiteite-(CaFeMg), whiteite-(CaMnMg), whiteite-(MnFeMg) | Physical, chemical and crystallographic description | SEM images | TEM images | vibrational spectra description | IR spectra | Raman spectra | N-IR spectra | F-IR spectra | IES spectra |