Electron Backscatter Diffraction (EBSD)
Combining EDS & EBSD together enabled the identification of this mineral as Chalcopyrite CuFeS2.
Phase
Orientation
Topography map - Fully
Orientation map - 12 mm out
Composition map - 20 mm out
BSE image
The FSD images above were produced by varying the camera insertion distance of the FSD detector. When the camera is fully inserted, topographical contrast is most dominant, but when retracted to 12 mm, orientation contrast is more visible. With further camera retraction, compositional contrast appears approaching the level of detail formerly only achievable with a backscatter electron (BSE) detector in the standard non-tilted imaging condition.
Wavelength Dispersive Spectrometry (WDS)
Sulfide Compounds
Galena (PbS) (top) and Cinnabar (HgS) (bottom) are sulfide compounds that have elemental peaks that directly overlap with the Si-Ka X-ray peak. The EDS (green) shows only a broad peak with some possible distortion from symmetric, but the WDS spectrum (red) distinctly isolates the individual contributions of the X-rays of each element to the analysis.