Marble is a metamorphic rock formed from rocks in the earth's crust under the action of high temperature and high pressure.
The internal forces of the earth's crust cause qualitative changes in rocks.
Rocks formed by qualitative changes are called metamorphic rocks.
Marble is mainly composed of calcite, limestone, serpentine and dolomite. Its main component is calcium carbonate, accounting for more than 50%.
Others include magnesium carbonate, calcium oxide, manganese oxide and silica.
Marble is generally soft in nature, and the metamorphic process will penetrate various minerals between different dense and dense layers, which forms the texture of marble.
Because the qualitative change process cannot be formed according to fixed rules, the texture of each piece of marble is different.