The rocks that are formed predominantly from the calcium carbonate shells of marine organisms are classified as biochemical.
Limestone is a common sedimentary rock composed primarily of the mineral calcite (CaCO3). It is formed by crystallization from water or by the accumulation of shell and shell debris. Limestone, a sedimentary rock, is composed primarily of calcite, the skeleton of microscopic organisms.
Most limestone forms on the ocean floor from calcium carbonate deposits and the remains of shell-bearing marine life. If limestone is found on land, it can be assumed that the area was previously submerged.
In general, rocks can be classified into three main types based on their formation process. These are; igneous rocks, sedimentary rocks, and metamorphic rocks.
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