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[http://www.geologyrocks.co.uk/tutorials/introduction_to_carbonates Carbonates] are sedimentary rocks composed of calcite (or occasionally aragonite), CaCO<sub>3</sub>, and dolomite,CaMg(CO<sub>3</sub>)<sub>2</sub>.  These rocks are called limestone and dolomite (formerly dolostone) respectively. When metamorphosed these become marble.
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[http://www.geologyrocks.co.uk/tutorials/introduction_to_carbonates Carbonates] are sedimentary rocks composed primarily of carbonate minerals, including calcite (CaCO<sub>3</sub>), aragonite (CaCO<sub>3</sub>), and dolomite (CaMg(CO<sub>3</sub>)<sub>2</sub>)The proportion of each mineral in a carbonate rock can be determined by [[SEM, XRD, CL, and XF methods|X-Ray Diffractometry]]. Carbonates more rich in calcite and/or aragonite are called limestone. Carbonate rocks composed mainly of the mineral dolomite are also called dolomite (formerly dolostone). When metamorphosed both rocks become marble.  
    
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[[Category:Sedimentology and stratigraphy – carbonate]]
 
[[Category:Sedimentology and stratigraphy – carbonate]]

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