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Originally Posted by ardecila
The biggest difference between the two is that limestone hardens from fossil/organic deposits over millions of years of heating, cooling, and intense pressure. Concrete hardens in a matter of days, or hours even..
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Hello Ardecila.
To further elaborate, regarding temperature and pressure states, is that when heat and pressure are the two primary constituents in rock formation, leading to crystallization of the rock grain, is called metamorphism [1], limestone not being the product of such process. Limestone, along with it's close cousin dolomite, being sedimentary rocks, as such, the act of sedimentary stratification in concurrence with chemical alteration of the rock is the primary means of limestone rock creation [2]. When exhibited to environmental conditions such as high pressure and temperature (below melting) being the primary rock forming process, leads to the creation of marble. Marble, being the metamorphic manifestation of limestone.
[1] Principles of Igneous and Metamorphic Petrology, (Anthony Philpotts, Jay Ague et. al. 2009), [2] Sedimentary Rocks in the Field: A Color Guide (Dorrik A.V. Stow et. al. 2005)