Where Is Onyx Mined?
Onyx is a chalcedony quartz, which falls in the microcystalline category, found in Brazil, India, California and Uruguay. It has a fine texture and black color. However, some onyx also displays white bands or ribbons against a black or brown background and this variety is known as sardonyx. It is formed in the gas cavities of lava. This gemstone is basically a multilayered stone like agates and depending on the different colored layers, onyx can be divided into a few separate categories. Generally when the stone has a black base and a white upper layer, it is called Onyx. Some onyx displays white and lighter reddish bands or ribbons of silicon di-oxide against a brown background, this variety is known as Sardonyx. When the onyx has a red base, it is known as Cornelian-onyx. Although onyx can be found worldwide, the most important place it is mined is Brazil. Brazil supplies the best mulit-colored untreated chalcedony. Gray chalcedony is found in India and China. If international trends
