SPI Supplies

Jadeite NaAlSi2O6

Locality: China

Element%Oxide%
O46.49
Na10.54 Na2O14.21
Al11.74 Al2O322.18
Si27.63 SiO259.11
Ca1.54 CaO 2.15
Fe1.01 FeO 1.30
Sum99.0 Sum99.0
200 µ m
This is a reflected light micrograph of a polished, carbon coated crystal of jadeite from China, where the best jade originates. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. Jadeite is widely used as the best standard for sodium in silicates because the Na atoms are more firmly locked in the dense pyroxene structure than in the more open felspar structure, and therefore show less tendency to migrate under electron bombardment.
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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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Sunday March 21, 2010
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