Formula: (Cu,Ag,Zn,Fe)12(As,Sb)4S13
Reflected/transmitted colour: opaque, except in very thin flinters, cherry-red, polished section gray, varying with admixed elements, commonly with bluish green tint
Pleochroism:
Optical isotropy/anisotropy: isotropic, polished section isotropic
Optical sign:
Refractive indices: n ≥ 2.72
Birefringence δ:
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 |