Formula: Ca2SiO2(OH,F)4
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.587, β = 1.590 (estimated), γ = 1.597
Birefringence δ: 0.010
2V angle: 70°
Dispersion: r > v, barely perceptible
Optical orientation: γ' ^ c = 27-29° on {010}, γ' ^ c = 46-48° on {100}
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 |