marble
CaCO3 --> CaO + CO2 Heated Calcium Carbonate (limestone) forms Calcium Oxide (quicklime) and Carbon Dioxide
Limestone is heated in a kiln at high temperatures (around 900-1000°C) to convert it into calcium oxide (quicklime). This process is called calcination, where limestone (CaCO3) releases carbon dioxide and water vapor to form calcium oxide (CaO).
Cement is a powdered substance made primarily from limestone, clay, and other minerals like iron ore and gypsum. It is not a direct mixture of limestone and silicon dioxide. The limestone and clay are heated together to form a compound called clinker, which is then ground into a fine powder to make cement.
Nature doesn't use anything to make cement. Cement is a human invention.
Cement is primarily made of calcium, silicon, aluminum, and iron. These minerals are typically found in the form of limestone, clay, shale, and sand, which are heated together to create the final cement powder.
Limestone
Limestone is the rock that is squeezed and heated to form marble. The high pressures and temperatures cause the limestone to recrystallize and become the metamorphic rock known as marble.
Limestone transforms into marble through a process called metamorphism, which occurs when limestone is subjected to high temperatures and pressures over time. The heat and pressure cause the calcite crystals in limestone to recrystallize and grow larger, resulting in a denser, harder rock with a distinct crystalline structure and a variety of colors and patterns.
It could recrystallize and form marble, under specific conditions of heat and pressure.
Granite heated under pressure can form a type of metamorphic rock called gneiss. This process causes the minerals in the granite to recrystallize and align in distinct patterns, giving gneiss its characteristic banded appearance.
Granite can form from the cooling and solidification of molten magma under high heat and pressure, usually deep within the Earth's crust. Shale, on the other hand, can form from the compaction and cementation of mud and clay particles under relatively lower heat and pressure, typically in shallow marine environments.
pressure, heat, time
When limestone is put under huge pressure, it will deform to form marble. This makes marble a metamorphic rock.
Carbon Dioxide (CO2)
anthracite coal is the metamorphic form of bituminous coal which is the sedimentary form. in other words it has been heated under pressure.
Limestone can metamorphose into marble, a regional metamorphic rock, or into skarn, a contact metamorphic rock.
When pure limestone undergoes metamorphism, it can transform into marble. Marble is a metamorphic rock composed primarily of calcite crystals that have recrystallized under high pressure and temperature conditions.