Formula: (Zn,Fe)S
Reflected/transmitted colour: polished section in air gray with a slight bluish tint, in oil very dark gray, yellow to brown internal reflections very common
Pleochroism:
Optical isotropy/anisotropy: uniaxial, polished section anisotropy not perceptible
Optical sign: +
Refractive indices: ε = 2.378, w = 2.356
Birefringence δ/bireflectance: ~ 0.022, polished section not perceptible
2V angle:
Dispersion:
Optical orientation:
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 |