Formula: Na(Ca,Mn)Al(PO4)(F,OH)3
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.557, β = 1.565, γ = 1.571
Bireflectance/Birefringence δ: 0.014
2V angle: 80° (calculated), 81° (measured)
Dispersion:
Optical orientation: Y = b, X Ù c = 24°
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 |