| The only important ore of cadmium is greenockite, or cadmium sulfide. |
| Kunz and Baskerville refer to a fluorescent greenockite from Franklin, but no data are given, and the description is of limited utility. |
| Cadmium occurs in nature as cadmium sulphide in greenockite, cds, which is very rare. |
| Isomorphous with greenockite is the hexagonal zinc sulphide known as wurtzite. |
| Prehnite and zeolites are typical associates of greenockite, but the latter remains the most elusive and prized species. |
| It occurs in combination with sulphur in greenockite, and in some ores of zinc. |
