In general, decorative stones and limestone are divided into travertine, marble, marble, porcelain and crystal.
Classification of stones based on their cutting and processing
The classification of building stones according to the criteria of cutting and processing is as follows:

Soft materials: These materials are easily cut with a saw (like all carbonate stones)
Semi-hard materials: These materials are cut to some extent with saws (like all external and internal igneous rocks and metamorphic rocks)
Of course, in addition to cutting stones, their processing is also one of the basic factors that must be considered.

The purpose is to use facade stones in decoration and beautification, so it is necessary that the selected stone is appropriate to the environmental conditions of the site to in addition to prolonging the life of the stone, prevent its premature destruction and maintain its facade and beauty.