SPI Minerals Group

	Element	%		Oxide	%		plagioclase
	O	46.93							This is a reflected light micrograph of polished, carbon coated plagioclase felspar crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. Felspars are the most abundant group of silicate minerals with compositions ranging from potassium to sodium to calcium rich end members. The plagioclases range from sodium rich (albite - #1 in this set) to calcium rich (anorthite). This example is a labradorite with 62% of the anorthite end member and is therefore a most useful standard for general silicate work. Locality: Unknown
	Na	3.31		Na2O	4.46
	Al	15.42		Al2O3	29.14
	Si	24.88		SiO2	53.22
	K	0.23		K2O	0.28
	Ca	8.91		CaO	12.47
	Ti	0.04		TiO2	0.07
	Fe	0.28		FeO	0.36
	Sum	100.0		Sum	100.0

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Name	Description	SPI #	Each
Plagioclase	SPI SuppliesŪ Individual Mounted Microanalysis Standard Item	AS1280-AB	$199.56