Formula: Mg2(PO4)(OH,F,O)
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.588, β = 1.592, γ = 1.598
Birefringence δ: 0.010
2V angle: measured: 70° , calculated: 80°
Dispersion:
Optical orientation: α = b, β =c, γ = a
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 |