Formula: MnS
Reflected/transmitted colour: opaque, but translucent in very thin splinters, deep green to brown and red, polished section gray, typical dark green to brownish internal reflections
Pleochroism:
Optical isotropy/anisotropy: isotropic, polished section isotropic, complete extinction. Sometimes a very weak anomalous anisotropy may be visible, light gray to gray-black
Optical sign:
Refractive indices: n = 2.70
Birefringence δ/bireflectance:
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 |