oxide
As for nickel oxide (II)(Nickel(II) oxide), a chemical formula is an inorganic compound of NiO. As for the oxide of the nickel, nickel oxide (III) or two nickel oxides are reported besides, but nickel oxide (II) is the nickel oxide that detailed structure becomes clear alone . There is of the yellowish-brown in a mineral of NiO, but is very rare. The mineral which colored nickel a little implication green has (chrysoprase) else.NiO takes the structure of the sodium chloride type, but it is it with the nonstoichiometric compound which the ratio of Ni:O often came off in the same way as metal oxide for other many hermaphrodites from 1:1.