SPI Minerals Group

	Element	%					marcasite
	S	53.46							This is a reflected light micrograph of polished, carbon coated pyrite crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. Pyrite is to sulfides as quartz is to silicates - the most common - and therefore its composition is an essential part of any mineral standard set. Locality: Joplin, Tri-state District, MO, USA
	Fe	46.54
	Sum	100.0

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Name	Description	SPI #	Each
Pyrite	SPI SuppliesŪ Individual Mounted Microanalysis Standard Item	AS1220-AB	$199.56