Zincite is the mineral form of zinc oxide (ZnO). In nature its crystal form is rare, with the exception of Franklin, New Jersey, an area also known for its fluorescent minerals. It has a hexagonal crystal structure and color that depends on impurities. The zincite found in Franklin, New Jersey is red colored (mostly due to iron and manganese) and associated with willemite and franklinite.
Zincite crystals can be grown artificially. The color can range from pale yellow to dark red.
See also
Reference