Natural Minerals Group

From the standards library of the SPI Supplies and the C. M. Taylor Company

# AS1160-AB



ElementWt % OxideWt %
C 12.96CO2 47.50
O 51.90
Mg 12.92MgO 21.43
Ca 22.16CaO 31.00
Mn 0.02MnO 0.02
Fe 0.03FeO 0.04
Sr 0.01SrO 0.01

Sum100.0 Sum100.0

Looose crystals

Locality: Sing Sing, New York, USA
This is a reflected light micrograph of polished, carbon coated dolomite crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. This is the best standard for Mg and Ca in mixed carbonate minerals. Dolomite has three good rhombohedral cleavages which results in polished surfaces often having a pitted appearance where the cleavages come together in a re-entrant.

Name Description SPI # Each
Dolomite SPI SuppliesŪ Individual Mounted Microanalysis Standard Item AS1160-AB $
Dolomite SPI SuppliesŪ Individual Loose Microanalysis Standard Item AS1165-AB $

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