Major Minerals:
* Dolomite (CaMg(CO3)2): This mineral is a common impurity in limestone, and limestones with a high dolomite content are called dolomitic limestones.
* Siderite (FeCO3): This iron carbonate mineral can give limestone a yellowish or brown color.
* Quartz (SiO2): This is a common mineral in sedimentary rocks, and it can be found in limestone as sand grains or as part of the rock matrix.
* Clay Minerals: These minerals can be present in limestone as a result of weathering or deposition.
* Organic Matter: Fossil fragments and other organic matter can be found in limestone, especially in biogenic limestones formed from the accumulation of marine organisms.
Minor Minerals:
* Pyrite (FeS2): This mineral gives limestone a metallic luster and can be found as small crystals or as disseminated grains.
* Calcite (CaCO3): While the main constituent of limestone, calcite can also exist in different crystal forms and can contribute to the overall appearance of the rock.
* Gypsum (CaSO4·2H2O): This mineral can be present in limestone as a result of evaporation of seawater or groundwater.
* Fluorite (CaF2): This mineral is relatively rare in limestone, but it can be found as small crystals or as disseminated grains.
The specific mineral composition of a limestone will vary depending on the origin of the rock, the environmental conditions under which it was formed, and the subsequent geological processes that it has experienced.
