What is an organic limestone?

Limestone is a chemically precipitated sedimentary rock. It can form directly, by calcium carbonate precipitating out of seawater and falling to the sea floor, to accumulate (lime mud). read more

‘Organic’ limestone would be lime rock composed largely or mostly of the shells and hard calcium carbonate remains of marine life. The adjective ‘organic’ is not often used nowadays, since it is not too specific, and can refer to any organic material, including, for instance, carbon (oil). read more

The limestone that makes up these cave formations is known as"travertine" and is a chemical sedimentary rock. A rock known as"tufa" is a limestone formed by evaporation at a hot spring, lake shore, or other area. read more

Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate. About 10% of sedimentary rocks are limestones. The solubility of limestone in water and weak acid solutions leads to karst landscapes, in which water erodes the limestone over thousands to millions of years. Most cave systems are through limestone bedrock. read more