. It is thermodynamically unstable at standard surface temperatures and pressures. It incorporates strontium ( Sr2+Sr raised to the 2 plus power

According to these recent syntheses, the origin of carbonate rocks differs from other sedimentary rocks in several ways: Biological Activity

While still on the seafloor, sediments interact with normal seawater. High wave energy can drive seawater through pore spaces, precipitating early fibrous or isopachous aragonite and high-magnesium calcite cements. This process can rapidly bind loose sand into hardgrounds. The Meteoric Zone

Tucker, M.E., & Wright, V.P. (1990). Carbonate Sedimentology . Blackwell Scientific Publications.

from the atmosphere and "locks" it into the geosphere for millions of years.

[PDF] Origin of Carbonate Sedimentary Rocks by Noel P. James

The majority of carbonates come from the skeletons and shells of organisms like corals, mollusks, and algae .