SPI Minerals Group

	Element	%		Oxide	%		benitoite
	O	34.83							This is a reflected light micrograph of a polished, carbon coated benitoite crystal. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. Benitoite is a gem mineral which gives a beautiful blue cathodoluminescence in the electron beam, thus making the spot clearly visible in an optical microscope. As a standard for Ba and Ti it is compromised by the proximity of the X-ray lines Ba Lα and Ti Kα (4.47 and 4.51 keV respectively). Its name comes from the type locality for this mineral in San Benito County, California. Locality: S. Benito Co., CA, USA
	Si	20.38		SiO2	43.60
	Ti	11.58		TiO2	19.32
	Ba	33.21		BaO	37.08
	Sum	100.0		Sum	100.0

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Name	Description	SPI #	Each
Benitoite	SPI SuppliesŪ Individual Mounted Microanalysis Standard Item	AS1060-AB	$199.56