| Gahnite | ZnAl2O4 |
| Galena | PbS |
| Gaspeite | (Ni,Mg,Fe)CO3 |
| Gaylussite | Na2Ca(CO3)2.5H2O |
| Geikielite | (Mg,Ti,O) |
| Geocronite | Pb14(Sb,As)6S23 |
| Germanite | (Cu,Ge,Ga,Fe,Zn,As,S) |
| Gersdorffite | NiAsS |
| Geversite | (Pt,Sb) |
| Gibbsite | Al(OH)3 |
| Glauberite | Na2Ca(SO4)2 |
| Glaucodot | (Cu,Fe,As,S) |
| Glaukosphaerite | (Cu,Ni)2(CO3)(OH)2 |
| Goethite | FeO(OH) |
| Goshenite | Be3Al2(SiO3)6 |
| Graphite | C |
| Gratonite | Pb9As4S15 |
| Greenockite | CdS |
| Grossular Garnet | Ca3Al2(SiO4)3 |
| Guettardite | Pb(Sb,As)2S4 |
| Gypsum | CaSO4.2H2O |