SPI Minerals Group

	Element	%		Oxide	%		sanidine
	O	46.28							This is a reflected light micrograph of polished, carbon coated sanidine crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. Sanidine is the potassium rich member of the felspar series, and this example is from a volcanic occurrence at the famous Hohenfels locality. This is the preferred standard for potassium, though care should be taken to avoid high electron beam loading to prevent alkali element migration. Locality: Hohenfels, Germany
	Na	2.23		Na2O	3.01
	Al	9.93		Al2O3	18.76
	Si	30.23		SiO2	64.67
	K	10.05		K2O	12.11
	Fe	0.14		FeO	0.18
	Ba	0.98		BaO	1.09
	Sum	99.8		Sum	99.8

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Name	Description	SPI #	Each
Sanidine	SPI SuppliesŪ Individual Mounted Microanalysis Standard Item	AS1330-AB	$199.56