Copper oxide (II) or copper oxide is an inorganic compound with the molecular formula of CuO. A black solid, one of two stable copper oxides, the other is Cu2O or copper (I) oxide (cuprous oxide). As a mineral, it is called nickel sulfide ore. It is the product of copper mining and the precursor of many other copper containing products and compounds. 
It is produced on a large scale by pyrometallurgy and is a stage of extracting copper from ores. The ore is treated with a water mixture of ammonium carbonate, ammonia and oxygen to obtain copper (I) and copper (II) ammonia complexes, which are extracted from solids. These complexes were decomposed by steam to obtain CuO.
It can be formed by heating copper in air at about 300 – 800 ° C:
Small black particles dispersed in the air. [Note: Exposure may occur in copper and brass plants and during copper alloy welding.]
Copper oxide (II) is a metal oxide with the molecular formula of CuO. It has an ionic structure. It contains a copper (2+) | copper oxide or copper oxide (II), which is an inorganic compound with the chemical formula CuO. Use of copper ii oxide formula is the precursor of many copper containing products such as wood preservatives and ceramics. Copper ii oxide may exist in over-the-counter vitamin and mineral supplements and is one of the sources of [DB09130]. The average daily dietary copper intake of adults ranges from 0.9 to 2.2 mg. Common routes of exposure to copper oxide include ingestion, skin contact and inhalation. Copper (II) oxide nanoparticles (NPCuO) have industrial applications as antibacterial agents in textiles and coatings and catalysts in organic synthesis. They may also be generated from e-waste. Copper oxide is a potential threat to health and environment due to its toxic and mutagenic particles producing living oxygen.