Dioptase is one of the most gorgeous and valuable minerals on Earth due to its high quality crystallization, amazing color, and rarity. Chemically, dioptase is a trigonal hydrated copper silicate- CuSiO3·H2O. It forms large rhombohedral crystals in oxidized copper ores that grow up to 3cm, though very uncommonly they can be larger. Dioptase is commonly associated with calcite and quartz as well as many other copper and lead secondary minerals such as malachite, chrysocolla, plancheite, shattuckite, wulfenit
What is Garnet? Types of Garnet