SPI Supplies

Magnetite Fe3O4

Locality: Serra Minas Gerais, Brazil

Element%Oxide%
O27.67
Cr0.14 Cr2O3 0.20
Fe72.19 FeO31.03
Fe2O368.76
Sum100.0 Sum100.0
200 µ m
This is a reflected light micrograph of polished, carbon coated crystals of magnetite from the famous Minas Gerais locality. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. This is a another useful standard which contains a high concentration of iron in an oxide matrix. Magnetite is so named because of its strong magnetism. The hardness of magnetite can be judged by the fact that the grains stand up above the polished surface of the mount, and its octahedral parting results in surface pitting.
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Cautionary Note
The compositional and other data shown here are intended to convey typical values for this item and do not neccessarily correspond in detail to standard mounts supplied in the past or to be supplied in the future. Items are changed from time to time as stock is exhausted or alternate choices are preferred. These data should, however, give someone contemplating the purchase of an SPI standard a fair indication of what they may expect to receive. Records are kept of all mounts sold so that, should you lose your documentation at some time in the future, we will be happy to replace it at no charge.


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Wednesday July 09, 2008
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