| Gabrielsonite | PbFe++(AsO4)(OH) | |
| Gadolinite-(Ce) | (Ce,La,Nd,Y)2Fe++Be2Si2O10 | |
| Gadolinite-(Y) | Y2Fe++Be2Si2O10 | |
| Gagarinite-(Y) | Nakalifite | NaCaY(F,Cl)6 |
| Gageite | (Mn,Mg,Zn)42Si16O54(OH)40 | |
| Gageite-2M | (Mn,Mg,Zn)42Si16O54(OH)40 | |
| Gahnite | Zinc Spinal | ZnAl2O4 |
| Gaidonnayite | Na2ZrSi3O9·2(H2O) | |
| Gainesite | NaNa(Be,Li)(Zr,Zn)2(PO4)4·1-2(H2O) | |
| Gaitite | Ca2Zn(AsO4)2·2(H2O) | |
| Galaxite | (Mn,Mg)(Al,Fe+++)2O4 | |
| Galeite | Na15(SO4)5F4Cl | |
| Galena | Blue Lead Lead Glance | PbS |
| Galenobismutite | PbBi2S4 | |
| Galileiite | IMA1996-028 | NaFe++4(PO4)3 |
| Galkhaite | (Cs,Tl)(Hg,Cu,Zn)6(As,Sb)4S12 | |
| Gallite | CuGaS2 | |
| Gallobeudantite | IMA1994-021 | PbGa3[(AsO4),(SO4)]2(OH)6 |
| Gamagarite | Ba2(Fe+++,Mn+++)(VO4)2(OH) | |
| Gananite | BiF3 | |
| Ganomalite | Pb9Ca5Mn++Si9O33 | |
| Ganophyllite | (K,Na)2(Mn,Al,Mg)8(Si,Al)40O96(OH)16·21(H2O) | |
| Gaotaiite | IMA1993-017 | Ir3Te8 |
| Garavellite | FeSbBiS4 | |
| Garrelsite-V | Ba3NaSi2B7O16(OH)4 | |
| Garrelsite-VIII | Ba3NaSi2B7O16(OH)4 | |
| Garronite | Na2Ca5Al12Si20O64·27(H2O) | |
| Gartrellite | Pb(Cu,Fe++)2(AsO4,SO4)2(CO3,H2O)0.7 | |
| Garyansellite | (Mg,Fe+++)3(PO4)2(OH,O)·1,5(H2O) | |
| Gasparite-(Ce) | CeAsO4 | |
| Gaspeite | (Ni,Mg,Fe++)CO3 | |
| Gatehouseite | Mn++5(PO4)2(OH)4 | |
| Gatumbaite | CaAl2(PO4)2(OH)2·(H2O) | |
| Gaudefroyite | Ca4Mn+++3-x(BO3)3(CO3)(O,OH)3 | |
| Gaultite | IMA1992-040 | Na4Zn2Si7O18·5(H2O) |
| Gaylussite | Gay Lussite Natrocalcite | Na2Ca(CO3)2·5(H2O) |
| Gearksutite | CaAl(OH,F)5·(H2O) | |
| Gebhardite | Pb8(As+++2O5)2OCl6 | |
| Gedrite | [ ]Mg5Al2Si6Al2O22(OH)2 | |
| Geerite | Cu8S5 | |
| Geffroyite | (Ag,Cu,Fe)9(Se,S)8 | |
| Gehlenite | Ca2Al(AlSi)O7 | |
| Geigerite | Mn5(AsO3OH)2(AsO4)2·10(H2O) | |
| Geikielite | MgTiO3 | |
| Geminite | Trichalcite | Cu++2As+++++2O7·3(H2O) |
| Genkinite | (Pt,Pd)4Sb3 | |
| Genthelvite | Zn4Be3(SiO4)3S | |
| Geocronite | Kilbrickenite | Pb14(Sb,As)6S23 |
| Georgbokiite | IMA1996-015 | Cu5O2(SeO3)2Cl2 |
| Georgechaoite | KNaZrSi3O9·2(H2O) | |
| Georgeericksenite | IMA1996-049 | Na6CaMg(IO3)6(CrO4)2·12(H2O) |
| Georgeite | Cu++5(CO3)3(OH)4·6(H2O) | |
| Georgiadesite | Pb4(AsO3)Cl4(OH) | |
| Gerasimovskite | (Mn,Ca)(Nb,Ti)5O12·9(H2O) (?) | |
| Gerdtremmelite | ZnAl2(AsO4)(OH)5 | |
| Gerenite-(Y) | IMA1993-034 | (Ca,Na)2(Y,REE)3Si6O18·2(H2O) |
| Gerhardtite | Cu2(NO3)(OH)3 | |
| Germanite | Cu26Fe4Ge4S32 | |
| Germanocolusite | Cu13V(Ge,As)3S16 | |
| Gersdorffite | Gray nickel pyrites Nickel glance | NiAsS |
| Gerstleyite | Na2(Sb,As)8S13·2(H2O) | |
| Gerstmannite | (Mg,Mn)2ZnSiO4(OH)2 | |
| Getchellite | AsSbS3 | |
| Geversite | Pt(Sb,Bi)2 | |
| Gianellaite | Hg4(SO4)N2 | |
| Gibbsite | Hydrargyllite | Al(OH)3 |
| Giessenite | Pb13(Cu,Ag)(Bi,Sb)9S28 (?) | |
| Gilalite | Cu5Si6O17·7(H2O) | |
| Gillespite | BaFe++Si4O10 | |
| Gillulyite | Tl2(As,Sb)8S13 | |
| Gilmarite | IMA1996-017 | Cu3(AsO4)(OH)3 |
| Giniite | Fe++Fe+++4(PO4)4(OH)2·2(H2O) | |
| Ginorite | Ca2B14O23·8(H2O) | |
| Giorgiosite | Mg5(CO3)4(OH)2·5(H2O) | |
| Giraudite | (Cu,Zn,Ag)12(As,Sb)4(Se,S)13 | |
| Girdite | Pb3H2(Te++++O3)(Te++++++O6) | |
| Girvasite | NaCa2Mg3(PO4)2[PO2(OH)2](CO3)(OH)2·4(H2O) | |
| Gismondine | Abrazite Aricite Gismondite | Ca2Al4Si4O16·9(H2O) |
| Gittinsite | CaZrSi2O7 | |
| Giuseppettite | (Na,K,Ca)7-8(Si,Al)12O24(SO4,Cl)1-2 | |
| Gladite | PbCuBi5S9 | |
| Gladiusite | IMA1998-011 | Fe+++2(Fe++,Mg)4(PO4)(OH)13·H2O |
| Glauberite | Glauber's Salt | Na2Ca(SO4)2 |
| Glaucocerinite | (Zn,Cu)5Al3(SO4)1.5(OH)16·9(H2O) | |
| Glaucochroite | CaMnSiO4 | |
| Glaucodot | (Co,Fe)AsS | |
| Glauconite | (K,Na)(Fe+++,Al,Mg)2(Si,Al)4O10(OH)2 | |
| Glaucophane | [ ]Na2(Mg3Al2)Si8O22(OH)2 | |
| Glaukosphaerite | (Cu,Ni)2(CO3)(OH)2 | |
| Glucine | CaBe4(PO4)2(OH)4·0.5(H2O) | |
| Glushinskite | Magnesium Oxalate | Mg(C2O4)·2(H2O) |
| Gmelinite | (Na2,Ca)Al2Si4O12·6(H2O) | |
| Gmelinite-Ca | (Ca,Na2)Al2Si4O12·6(H2O) | |
| Gmelinite-K | IMA1999-039 | (K,Na,Ca)(Al7Si17O48)·22H2O |
| Gmelinite-Na | (Na2,Ca)Al2Si4O12·6(H2O) | |
| Gobbinsite | (Na2,Ca)2K2Al6Si10O32·12(H2O) | |
| Godlevskite | (Ni,Fe)7S6 | |
| Godovikovite | (NH4)(Al,Fe+++)(SO4)2 | |
| Goedkenite | (Sr,Ca)2Al(PO4)2(OH) | |
| Goethite | Acicular iron ore Limonite Needle ironstone | Fe+++O(OH) |
| Gold | Electrum - Ag Alloy Oro | Au |
| Goldamalgam | (Au,Ag)Hg | |
| Goldfieldite | Cu12(Te,Sb,As)4S13 | |
| Goldichite | KFe+++(SO4)2·4(H2O) | |
| Goldmanite | Ca3(V,Al,Fe+++)2(SiO4)3 | |
| Gonnardite | Na2CaAl4Si6O20·7(H2O) | |
| Gonyerite | Mn++3[Mn++3Fe+++][(Si,Fe+++)4O10](OH,O)8 | |
| Goosecreekite | CaAl2Si6O16·5(H2O) | |
| Gorceixite | Fava pebbles | BaAl3(PO4)(PO3OH)(OH)6 |
| Gordaite | IMA1996-006 | NaZn(SO4)(OH)6Cl·6(H2O) |
| Gordonite | MgAl2(PO4)2(OH)2·8(H2O) | |
| Gorgeyite | Goergeyite | K2Ca5(SO4)6·(H2O) |
| Gormanite | Fe++3Al4(PO4)4(OH)6·2(H2O) | |
| Gortdrumite | (Cu,Fe)6Hg2S5 | |
| Goslarite | ZnSO4·7(H2O) | |
| Gottardiite | IMA1994-054 | Na3Mg3Ca5Al19Si117O272·93(H2O) |
| Gottlobite | IMA1998-066 | CaMg(VO4,AsO4)(OH) |
| Gotzenite | Calcium rinkite Goetzenite | (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 |
| Goudeyite | (Al,Y)Cu6(AsO4)3(OH)6·3(H2O) | |
| Gowerite | CaB6O10·5(H2O) | |
| Goyazite | Hamlinite Lusungite Bowmanite | SrAl3(PO4)2(OH)5·(H2O) |
| Graemite | CuTeO3·(H2O) | |
| Graeserite | IMA1996-010 | (Fe+++,Ti)4Ti3AsO13(OH) |
| Graftonite | (Fe++,Mn,Ca)3(PO4)2 | |
| Grandidierite | (Mg,Fe++)Al3(BO4)(SiO4)O | |
| Grandreefite | Pb2SO4F2 | |
| Grantsite | Na4CaxV++++2xV+++++12-2xO32·8(H2O) | |
| Graphite | Black Lead Plumbago | C |
| Gratonite | Pb9As4S15 | |
| Grattarolaite | IMA1995-037 | Fe+++3O3(PO4) |
| Gravegliaite | Mn++(SO3)·3(H2O) | |
| Grayite | (Th,Pb,Ca)PO4·(H2O) | |
| Grechishchevite | Hg3S2(Br,Cl,I)2 | |
| Greenalite | (Fe++,Fe+++)2-3Si2O5(OH)4 | |
| Greenockite | CdS | |
| Gregoryite | (Na2,K2,Ca)CO3 | |
| Greigite | Melnikovite | Fe++Fe+++2S4 |
| Griceite | LiF | |
| Griffithite | 4(Mg,Fe,Ca)O.(Al,Fe)2O3.5SiO2·7(H2O) | |
| Grimaldiite | Cr+++O(OH) | |
| Grimselite | K3Na(UO2)(CO3)3·(H2O) | |
| Griphite | Ca(Mn,Na,Li)6Fe++Al2(PO4)6(F,OH)2 | |
| Grischunite | NaCa2Mn++5Fe+++(AsO4)6·2(H2O) | |
| Grossite | CaAl4O7 | |
| Grossular | Tsavorite - emerald green Hessonite - brownish orange Grossularite | Ca3Al2(SiO4)3 |
| Groutite | Mn+++O(OH) | |
| Grumantite | NaHSi2O5·(H2O) | |
| Grumiplucite | IMA1997-021 | HgBi2S4 |
| Grunerite | Amosite | [ ]Fe++7Si8O22(OH)2 |
| Gruzdevite | Cu6Hg3Sb4S12 | |
| Guanajuatite | Bi2Se3 | |
| Guanine | C5H3(NH2)N4O | |
| Guarinoite | (Zn,Co,Ni)6(SO4)(OH,Cl)10·5(H2O) | |
| Gudmundite | FeSbS | |
| Guerinite | Ca5(AsO3OH)2(AsO4)2·9(H2O) | |
| Guettardite | Pb(Sb,As)2S4 | |
| Gugiaite | Ca2BeSi2O7 | |
| Guildite | CuFe+++(SO4)2(OH)·4(H2O) | |
| Guilleminite | Ba(UO2)3(SeO3)2O2·3(H2O) | |
| Gunningite | (Zn,Mn)SO4·(H2O) | |
| Gupeiite | Fe3Si | |
| Gustavite | PbAgBi3S6 (?) | |
| Gutsevichite | Al3(PO4)2(OH)3·8(H2O) | |
| Guyanaite | CrO(OH) | |
| Gwihabaite | (NH4,K)(NO3) | |
| Gypsum | Alabaster Selenite Satin Spar | CaSO4·2(H2O) |
| Gyrolite | Centrallasite | NaCa16Si23AlO60(OH)8·64(H2O) |
| Gysinite-(Nd) | Pb(Nd,La)(CO3)2(OH)·(H2O) |