| Name: | Geffroyite Gef |
| IMA Chemistry: | (Cu,Fe,Ag)9Se8 |
| Chemistry Elements: | The mineral Geffroyite contains elements: Copper (Cu) Iron (Fe) Silver (Ag) Selenium (Se) |
| Country of Type Locality: | France |
| Year First Published: | 1980 |
| IMA Status: | Approved |
| Status Notes: | Johan Z, Picot P, Ruhlmann F (1982) Evolution paragénétique de la minéralisation uranifère de Chaméane (Puy-de-Dôme), France: chaméanite, geffroyite et giraudite, trois séléniures nouveaux de Cu, Fe, Ag et As, Tschermaks Mineralogische und Petrographische Mitteilungen 29, 151-167 |
| Structural Group Name: | Pentlandite |
| Fleischer's Group Name: | pentlandite |
| Crystal Systems: | cubic |
| Oldest Known Age: | 1850 Million Years Ago |
| More Info: | Search Wikipedia: Geffroyite (Wiki) Search Mindat: Geffroyite Search Web Mineral DB: Geffroyite |