SPI Minerals Group

	Element	%		Oxide	%		jadeite
	O	47.40							This is a reflected light micrograph of polished, carbon coated crystals 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. Locality: China
	Na	11.20		Na2O	15.10
	Al	13.05		Al2O3	24.66
	Si	27.74		SiO2	59.34
	Ca	0.55		CaO	0.77
	Fe	0.16		Fe2O3	0.23
	Sum	100.1		Sum	100.1

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Name	Description	SPI #	Each
Jadeite	SPI SuppliesŪ Individual Mounted Microanalysis Standard Item	AS1190-AB	$199.56