SPI Minerals Group

	Element	%		Oxide	%		calcite
	C	12.02		CO2	44.04				This is a reflected light micrograph of polished, carbon coated calcite crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. The rhombohedral cleavage of calcite is visible in these crystals. Iceland spar is the purest form of calcite and is a excellent standard for calcium in carbonates, providing care is taken to avoid excessive beam loading which might cause thermal damage and loss of CO2. Variety: Iceland Spar; Locality unknown
	O	47.98
	Mg	0.01		MgO	0.02
	Ca	39.98		CaO	55.94
	Mn	0.01		MnO	0.01
	Sum	100.0		Sum	100.0

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Name	Description	SPI #	Each
Calcite	SPI SuppliesŪ Individual Mounted Microanalysis Standard Item	AS1090-AB	$199.56