Onyx Stone, a type of limestone, is derived from the Greek root of Marmoros meaning luminous and trademark Onyx. Important features of this stone are that light passing through glass and polish is very high and can be polished to a mirror appearance. These rocks have different minerals and colors and their main features include beautiful color and good shine.
These types of stones are used in stairs, interior facades, columns and floors, and especially as ornaments in decoration.
There are some of the best marble mines in the world in Iran and Italy, which are superior to Italy in color diversity. The color variation is due to the presence of iron, aluminum and magnesium salts. If it contains hydrous iron oxide, the color may be brown or yellow.
Its red or pink color is due to the presence of dehydrated or dehydrated iron oxide, such as the pink ore in western Azerbaijan province and if they contain manganese or charcoal, their color is blue, gray or black. Some marbles have veins, some are stripes and some are speckled or corrugated. Due to proximity and regional metamorphism, metamorphic deposits are formed.