SPI Minerals Group

	Element	%		Oxide	%		biotite
	H	0.46		H2O	4.11				This is a reflected light micrograph of polished, carbon coated biotite crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. Biotite is a micaceous mineral which forms platy, often curved crystals. Here the crystals are seen sideways on, as wispy flakes which are quite large enough to position an electron beam. The name refers to the French mineralogist Biot. Locality unknown
	O	43.95
	Mg	11.77		MgO	19.52
	Al	8.01		Al2O3	15.13
	Si	18.10		SiO2	38.72
	K	8.23		K2O	9.91
	Ca	0.07		CaO	0.10
	Ti	1.06		TiO2	1.77
	Mn	0.03		MnO	0.04
	Fe	8.33		FeO	10.72
	Sum	100.0		Sum	100.0

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Name	Description	SPI #	Each
Biotite	SPI SuppliesŪ Individual Mounted Microanalysis Standard Item	AS1070-AB	$199.56