SPI Minerals Group

	Element	%		Oxide	%		bustamite
	O	38.39							This is a reflected light micrograph of a polished, carbon coated bustamite crystal. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. Similar to rhodonite, another manganese rich silicate, also in this standard, bustamite has more calcium, thus providing an opportunity for cross checking the composition of Ca Mn silicates. Locality: Broken Hill, NSW, Australia
	Na	0.04		Na2O	0.05
	Al	0.02		Al2O3	0.04
	Si	22.46		SiO2	48.05
	K	0.05		K2O	0.06
	Ca	13.56		CaO	18.97
	Mn	18.83		MnO	24.31
	Fe	6.32		FeO	8.13
	Zn	0.20		ZnO	0.25
	Sum	99.9		Sum	99.9

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Name	Description	SPI #	Each
Bustamite	SPI SuppliesŪ Individual Mounted Microanalysis Standard Item	AS1080-AB	$199.56