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How is limestone classified?

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Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. read more

Limestone, a common sedimentary rock composed primarily of the mineral calcite (CaCO3). Limestone constitutes approximately 10 percent of the sedimentary rocks exposed on the earth's surface. It forms either by direct crystallization from water (usually seawater) or by accumulation of shell and shell fragments. read more

Coquina is a type of porous limestone that is chiefly composed of fossil debris. Width of view 40 cm. Ooid sand from Abu Dhabi, The United Arab Emirates. The width of the view is 5.5 mm. Oolite is a lithified ooid sand. Glauconitic limestone from Estonia (Ordovician). Limestone with a significant amount of clay minerals is known as marl. read more

Arenaceous Limestone: This image is a microscopic view of a polished surface of the Loyalhanna Limestone from Fayette County, Pennsylvania. The Loyalhanna is a Late Mississippian calcareous sandstone to arenaceous limestone, composed of siliceous sand grains embedded in a calcium carbonate matrix or bound by a calcium carbonate cement. read more

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