SPI Minerals Group

	Element	%		Oxide	%		chrome_diopside
	O	43.92							This is a reflected light micrograph of polished, carbon coated chrome diopside crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. This material is a good standard for Cr in silicates where, when it occurs, is usually in small concentrations. Due to the presence of chromium (Greek root chrom = color) the material is brilliant green which can be seen when the mount is viewed with the naked eye. This sample comes from Batbjerg in East Greenland.
	Na	0.33		Na2O	0.44
	Mg	10.34		MgO	17.15
	Si	25.52		SiO2	54.60
	Ca	18.23		CaO	25.51
	Ti	0.06		TiO2	0.10
	Cr	0.34		Cr2O3	0.50
	Fe	1.08		FeO	1.39
	Sum	99.8		Sum	99.7

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Name	Description	SPI #	Each
Chrome Diopside	SPI SuppliesŪ Individual Mounted Microanalysis Standard Item	AS1120-AB	$199.56