Carbonate rocks. Carbonate rocks are composed of two minerals Calcite CaCO 3 Dolomite Ca Mg (CO 3 ). The principal constituents of limestones are 1. Allochemical components (ooids, bioclasts, peloids and intraclasts)
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Carbonate rocks are composed of two minerals
Dolomite Ca Mg (CO3 )
The principal constituents of limestones are
1. Allochemical components (ooids, bioclasts, peloids and intraclasts)
2. Micrite (microcrystalline calcite: refers to a crystal size less than 5 um)
3. Sparite (sparry calcite; refers to crystals of 5 um or more in diameter)
Dunham classification of limestone
The matrix have been replaced by dolomite, showing its characteristic euhedral rhombic shape
A limestone section which has been treated with Alizarine Red S. Calcite showing shades of pink, red, and brown. The dolomite is colorless to grey and appears to be replacing matrix and/or cement.
Dolomitic carbonate are classified according to their dolomite content:
10-50% dolomitic limestone
50-90% calcitic dolomite