Main ingredients of marble

Generally, marble contains a small amount of other metamorphic minerals, which belong to carbonate stone. Its main component is calcium carbonate, accounting for more than 50%. Because the original rock contains different impurities (siliceous, argillaceous, carbonaceous, Iron, pyroclastic materials, etc.), and the temperature, pressure, and water content of the metamorphosis, as well as the associated minerals. like:

In the marble composed of relatively pure carbonate rocks, calcite and dolomite account for more than 90%, sometimes containing very little graphite, muscovite, magnetite, pyrite, etc., and calcite can be transformed under low temperature and high pressure Written stone

Marble composed of siliceous carbonate rocks can contain talc, tremolite, actinolite, quartz, etc. at medium and low temperatures, and diopside and orthopyroxene at medium and high temperatures. , Forsterite, wollastonite, periclase, etc., under the conditions of high temperature and low pressure, it can present granular wollastonite, forsterite, forsterite, etc.;

Marble composed of argillaceous carbonate rocks can contain serpentine, chlorite, epidote, zoisite, fushanite, biotite, acid plagioclase, and micro Plagioclase, etc., can contain calcite, garnet, magnesite, phlogopite, spinel, apatite, basic plagioclase, orthoclase, etc. at medium and high temperatures.

Marble generally has a typical granular metamorphic structure, with different grain thicknesses. The calcite and dolomite particles in the rock form a tight mosaic structure. In the marble formed by metamorphosis in some regions, the calcite has a strong light transmission due to the directional arrangement of the optical axis of the calcite. Some marbles can transmit 2 cm of light, which is a good carving material. Marbles are mostly block-like structures, but there are also many structures with stripes, stripes, patches or spots. After processing, they become decorative building materials with different colors and patterns.

Marble is generally pure white, and white marble is generally called white marble. Some have a variety of beautiful colors and patterns, such as light gray, light red, light yellow, green, brown, black, etc. The reason is that the marble contains a small amount of colored minerals and impurities. For example, the marble containing manganese calcite is pink. , The marble contains graphite in gray, serpentine is yellow-green, chlorite, actinolite and diopside are green, phlogopite and schneiderite are yellow, and it contains fushanite and garnet It is brown and so on.