Formula: Ca4B4(BO4)(SiO4)3(OH)3 . H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: a = 1.624, b = 1.635, g = 1.654
Birefringence δ: 0.03
2V angle: 87-88°
Dispersion:
Optical orientation: b = b, g Ù c = 44°
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 |