Marble is formed by the metamorphic rock of sedimentary rock and sedimentary rock, main composition is calcium carbonate, its content is about 50%-75%, show weak alkalinity.Some marble contains a certain amount of silica, some do not contain silica.Fine particles (refers to calcium carbonate), the surface fringe distribution is generally more irregular, hardness is lower.
Class A: high quality marble, with the same, excellent processing quality, free of impurities and pores.
Class B: the characteristics are close to the former type of marble, but the processing quality is slightly worse than the former;There are natural defects;Small amounts of separation, gluing, and filling are required.
Class C: there are some differences in processing quality;Defects, pores and texture fractures are common.These differences are moderately difficult to repair by separating, gluing, filling, or reinforcing one or more of these methods.
Class D: the characteristics are similar to those of class C marble, but it contains more natural defects and has the greatest difference in processing quality, which requires the same method for multiple surface treatments.This kind of marble complicates a lot of colour rich stone material, they have very good adornment value.
