Natural Minerals Group

From the standards library of SPI Supplies and the C. M. Taylor Company

# AS1140-AB



ElementWt % OxideWt %
O 19.80
Cr 16.09CrO3 30.94
Pb 64.11PbO 69.06

Sum100.0 Sum100.0

Loose crystals

Locality: Dundas, Tasmania, Australia
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.
Click here for a mineralogical account of everything you might want to know about Crocoite.

Name Description SPI # Each
Crocoite SPI SuppliesŪ Individual Mounted Microanalysis Standard Item AS1140-AB $
Crocoite SPI SuppliesŪ Individual Loose Microanalysis Standard Item AS1145-AB $

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