Cuprite is usually formed as a secondary mineral in the oxidized
zone of copper deposits. It is commonly found accompanied by malachite
and chalcocite. Small deposits of cuprite are sometimes found in association with malachite or azurite, on ancient coins that have been buried for thousands of years. The only source of very large cuprite stones yielding up to 300 carats, is Onganja, Namibia. The most well-known and major sources of cuprite can be found in South Australia
, Northeast France
, Southwest Germany, East-central Greece, Chile, Mexico
and England. Only some crystals from Santa Rita, New Mexico are suitable for cutting into beautiful stones for display. Cuprite can also be found in Zaire, Japan
, Hungary, and in the United States in Pennsylvania, Tennessee, and Michigan.