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This is a reflected light micrograph of polished, carbon coated crocoite crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. This is a useful standard for both
lead and chromium. Metallic lead is very soft and therefore difficult to polish, and galena (PbS), has the problem that the X- ray lines for Pb Mα and S Kα overlap in an EDS system. It is in
short supply, hence the small (but adequate) number of crystals in the mount. It is a brilliant orange color.
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