| Element | % |
| S | 13.40 |
| Pb | 86.60 |
|
|
| Sum | 100.0 |
|
|  | |
| 200 µ m
| |
|
This is a reflected light micrograph of polished, carbon coated galena crystals.
The identifying etched label, which is a feature
of our standards, is invaluable for navigating in an electron beam instrument.
Galena is a useful
standard which contains a high concentration of lead, but the similarity of energies
of Pb Ma (2.34 keV) and S Ka (2.31 keV) means that these two lines can only be
resolved with a wavelength dispersive spectrometer. It is such a common sulfide
mineral, however, that it is an essential part of any standard set.
|