| taaffeite | Mg3Al8BeO16 |
| tacharanite | Ca12Al2Si18O51·18H2O |
| tachyhydrite | CaMg2Cl6·12H2O |
| tadzhikite-(Ce) | Ca3(Ce,Nd,La)2(TI,Al,Fe)B4Si4O22 |
| tadzhikite-(Y) | Ca3(Y,Ce)2(TI,Al,Fe)B4Si4O22 |
| taenite | (Ni,Fe) |
| taikanite | BaSr2Mn2Si4O14 |
| tainiolite | KLiMg2Si4O10F2 |
| takanelite | (Mn,Co)Mn4O9·H2O |
| takedaite | Ca3B2O6 |
| takeuchiite | (Mg,Mn)2(Mn,Fe)BO5 |
| takovite | Ni6Al2(CO3,OH)(OH)16·4H2O |
| talc | Mg3Si4O10(OH)2 |
| talmessite | Ca2Mg(AsO4)2·2H2O |
| talnakhite | Cu9(Fe,Ni)8S16 |
| tamarugite | NaAl(SO4)2·6H2O |
| tancoite | HNa2LiAl(PO4)2OH |
| taneyamalite | Na(Mn,Mg,Fe)12Si12(O,OH)44 |
| tangeite | CaCuVO4OH |
| tantalaeschynite-(Y) | (Y,Ce,Ca)(Ta,Ti,Nb)2O6 |
| tantalcarbide | (Ta,Nb)C |
| tantalite | either ferrotantalite, manganotantalite |
| tanteuxenite-(Y) | (Y,Ce,Ca)(Ta,Nb,Ti)2(O,OH)6 |
| tantite | Ta2O5 |
| tanzanite | zoisite |
| tapiolite | either ferrotapiolite, manganotapiolite |
| tapiolite group | |
| taramellite | Ba4(Fe3+,Ti,Fe2+,Mg)4B2Si8O29Clx |
| taramite | Na2CaFe3AlFeSi6Al2O22(OH)2 |
| taranakite | (K,NH4)Al3(PO4)3OH·9H2O |
| tarapacaite | K2CrO4 |
| tarbuttite | Zn2PO4OH |
| tarkianite | (Pd,Ag)2Te |
| tatarskite | Ca6Mg2(SO4)2(CO3)2Cl4(OH)4·7H2O |
| tausonite | SrTiO3 |
| tavistockite | hydroxylapatite |
| tavorite | LiFePO4OH |
| taylorite | arcanite |
| tazheranite | (Zr,TI,Ca)O2 |
| teallite | PbSnS2 |
| teepleite | Na2BCl(OH)4 |
| teineite | CuTeO3·2H2O |
| telargpalite | (Pd,Ag)3Te |
| tellurantimony | Sb2Te3 |
| tellurite | TeO2 |
| tellurium | Te |
| tellurobismuthite | Bi2Te3 |
| tellurohauchecornite | Ni9BiTeS8 |
| telluronevskite | Bi(Te,S) |
| telluropalladinite | Pd9Te4 |
| temagamite | Pd3HgTe3 |
| tengchongite | CaU6Mo2O25·12H2O |
| tengerite-(Y) | Y2(CO3)3·2-3H2O |
| tennantite | (Cu,Fe)12As4S13 |
| tenorite | CuO |
| tephroite | Mn2SiO4 |
| terlinguaite | Hg2ClO |
| ternesite | Ca5(SiO4)2SO4 |
| ternovite | (Mg,Ca)Nb4O11·~10H2O |
| terranovaite | NaCaAl3Si17O40·>7H2O |
| terskite | Na4ZrSi6O15(OH)2·H2O |
| tertschite | Ca4B10O19·20H2O |
| teruelite | dolomite |
| teruggite | Ca4MgAs2B12O22(OH)12·12H2O |
| teschemacherite | NH4HCO3 |
| testibiopalladite | Pd(Sb,Bi)Te |
| tetra-auricupride | AuCu |
| tetradymite | Bi2Te2S |
| tetradymite group | |
| tetra-ferri-annite | KFe3FeSi3O10(OH)2 |
| tetra-ferriphlogopite | KMg3FeSi3O10(OH)2 |
| tetraferroplatinum | PtFe |
| tetrahedrite | (Cu,Fe)12Sb4S13 |
| tetrahedrite group | |
| tetranatrolite | Na2Al2Si3O10·2H2O |
| tetrarooseveltite | BiAsO4 |
| tetrataenite | FeNi |
| tetrawickmanite | MnSn(OH)6 |
| thadeuite | (Ca,Mn)(Mg,Fe,Mn)3(PO4)2(OH,F)2 |
| thalcusite | Tl2(Cu,Fe)4S4 |
| thalenite-(Y) | Y3Si3O10OH |
| thalfenisite | Tl6(Fe,Ni,Cu)25S26Cl |
| thaumasite | Ca6Si2(CO3)2(SO4)2(OH)12·24H2O |
| theisite | Cu5Zn5(As,Sb)2O8(OH)14 |
| thenardite | Na2SO4 |
| theophrastite | Ni(OH)2 |
| theresemagnanite | (Co,Zn,Ni)6SO4(OH,Cl)10·8H2O |
| thermonatrite | Na2CO3·H2O |
| thometzekite | Pb(Cu,Zn)2(AsO4)2·2H2O |
| thomsenolite | NaCaAlF6·H2O |
| thomsonite | NaCa2Al5Si5O20·6H2O |
| thorbastnaesite | Th(Ca,Ce)(CO3)2F2·3H2O |
| thoreaulite | SnTa2O6 |
| thorianite | ThO2 |
| thorikosite | Pb3(Sb,As)O3OHCl2 |
| thorite | ThSiO4 |
| thornasite | (Na,K)ThSi11(O,F,OH)25·8H2O |
| thorogummite | Th(SiO4)1-X(OH)4X |
| thorosteenstrupine | (Ca,Th,Mn)3Si4O11F·6H2O |
| thortveitite | (Sc,Y)2Si2O7 |
| thorutite | (Th,U,Ca)Ti2(O,OH)6 |
| threadgoldite | Al(UO2)2(PO4)2OH·8H2O |
| thulite | zoisite |
| tiemannite | HgSe |
| tienshanite | BaNa2MnTiB2Si6O20 |
| tiettaite | (Na,K)17FeTiSi16O29(OH)30·2H2O |
| tikhonenkovite | SrAlF4OH·H2O |
| tilasite | CaMgAsO4F |
| tilleyite | Ca5Si2O7(CO3)2 |
| tin | Sn |
| tinaksite | K2Na(Ca,Mn)2TiSi7O19OH |
| tincalconite | Na2B4O5(OH)4·3H2O |
| tinsleyite | KAl2(PO4)2OH·2H2O |
| tinticite | Fe4(PO4)3(OH)3·53H2O |
| tintinaite | Pb22Cu4(Sb,Bi)30S69 |
| tinzenite | (Ca,Mn,Fe)3Al2BSi4O15OH |
| tiptopite | K2(Na,Ca)2Li3Be6(PO4)6(OH)2·H2O |
| tiragalloite | Mn4AsSi3O12OH |
| tirodite | manganocummingtonite |
| tisinalite | H3Na3(Mn,Ca,Fe)TiSi6(O,OH)18·2H2O |
| titanite | CaTiSiO5 |
| titanite group | |
| titanowodginite | MnTiTa2O8 |
| titantaramellite | Ba4(Ti,Fe3+,Fe2+,Mg)4B2Si8O29Clx |
| tivanite | VTiO3OH |
| tlalocite | (Cu,Zn)16TeO3(TeO4)2(OH)25Cl·27H2O |
| tlapallite | H6(Ca,Pb)2(Cu,Zn)3SO4(TeO3)4TeO6 |
| tobelite | NH4Al2AlSi3O10(OH)2 |
| tobermorite | Ca5Si6(O,OH)18·5H2O |
| tochilinite | 6Fe0.9S·5(Mg,Fe)(OH)2 |
| tocornalite | (Ag,Hg)I |
| todorokite | (Mn,Ca,Mg)Mn3O7·H2O |
| tokkoite | K2Ca4Si7O17(O,OH,F)4 |
| tolbachite | CuCl2 |
| tolovkite | IrSbS |
| tombarthite-(Y) | Y4(Si,H4)4O12-X(OH)4+2X |
| tomichite | (V,Fe)4Ti3AsO13OH |
| tongbaite | Cr3C2 |
| tooeleite | Fe8(AsO4)6(OH)6·5H2O |
| topaz | Al2SiO4(F,OH)2 |
| torbernite | Cu(UO2)2(PO4)2·8-12H2O |
| tornebohmite-(Ce) | (Ce,La)2Al(SiO4)2OH |
| tornebohmite-(La) | (La,Ce)2Al(SiO4)2OH |
| torreyite | (Mg,Mn)9Zn4(SO4)2(OH)22·8H2O |
| tosudite | a magnesium iron hydroxyaluminosilicate |
| tounkite | (Na,Ca,K)8Al6Si6O24(SO4)2Cl·H2O |
| tourmaline group | |
| toyohaite | Ag2FeSn3S8 |
| trabzonite | Ca4Si3O10·2H2O |
| tranquillityite | Fe8(Zr,Y)2Ti3Si3O24 |
| traskite | Ba9Fe2Ti2(SiO3)12(OH,Cl,F)6·6H2O |
| treasurite | Ag7Pb6Bi15S32 |
| trechmannite | AgAsS2 |
| trembathite | (Mg,Fe)3B7O13Cl |
| tremolite | Ca2Mg5Si8O22(OH)2 |
| trevorite | NiFe2O4 |
| triangulite | Al3(UO2)4(PO4)4(OH)5·5H2O |
| trichalcite | Cu3(AsO4)2·4-5H2O |
| tridymite | SiO2 |
| trigonite | Pb3Mn(AsO3)2AsO2OH |
| trikalsilite | (K,Na)AlSiO4 |
| trilithionite | KLi1.5Al1.5Si3O10F2 |
| trimerite | CaMn2Be3(SiO4)3 |
| trimounsite-(Y) | Y2Ti2SiO6 |
| triphylite | LiFePO4 |
| triplite | (Mn,Fe,Mg,Ca)2PO4(F,OH) |
| triploidite | (Mn,Fe)2PO4OH |
| trippkeite | CuAs2O4 |
| tripuhyite | FeSb2O6 |
| tristramite | (Ca,U,Fe)(PO4,SO4)·2H2O |
| tritomite-(Ce) | (Ce,La,Y,Th)5(Si,B,Al)3(O,OH,F)13 |
| tritomite-(Y) | (Y,Ca,La,Fe)5(Si,B,Al)3(O,OH,F)13 |
| troegerite | (UO2)3(AsO4)2·12H2O |
| trogtalite | CoSe2 |
| troilite | FeS |
| trolleite | Al4(PO4)3(OH)3 |
| trona | Na3CO3(HCO3)·2H2O |
| troostite | willemite |
| truscottite | (Ca,Mn)14Si24O58(OH)8·2H2O |
| trustedtite | Ni3Se4 |
| tsaregorodtsevite | N(CH3)4[Si2(Si0.5Al0.5)O6]2 |
| tschermakite | Ca2Mg3AlFeSi6Al2O22(OH)2 |
| tschermigite | NH4Al(SO4)2·12H2O |
| tschernichite | CaAl2Si6O16·~8H2O |
| tschortnerite | Ca4(K2,Ca,Sr,Ba)3Cu3Al12Si12O48(OH)8·20H2O |
| tsnigriite | Ag9SbTe3(S,Se)3 |
| tsugaruite | Pb4As2S7 |
| tsumcorite | PbZnFe(AsO4)2·H2O |
| tsumebite | Pb2CuPO4SO4OH |
| tsumoite | BiTe |
| tucekite | Ni9Sb2S8 |
| tugarinovite | MoO2 |
| tugtupite | Na4AlBeSi4O12Cl |
| tuhualite | (Na,K)FeFeSi6O15 |
| tulameenite | Pt2FeCu |
| tuliokite | BaNa6Th(CO3)6·6H2O |
| tundrite-(Ce) | Na3(Ce,La)4(Ti,Nb)2(SiO4)2(CO3)3O4OH·2H2O |
| tundrite-(Nd) | Na3(Nd,La)4(Ti,Nb)2(SiO4)2(CO3)3O4OH·2H2O |
| tunellite | SrB6O9(OH)2·3H2O |
| tungsten | W |
| tungstenite | WS2 |
| tungstibite | Sb2O3·WO3 |
| tungstite | WO3·H2O |
| tungusite | Ca14Fe9Si24O60(OH)22 |
| tunisite | NaCa2Al4(CO3)4(OH)8Cl |
| tunnerite | wad |
| tuperssuatsiaite | NaFe3Si8O20(OH)2·4H2O |
| turanite | Cu5(VO4)2(OH)4 |
| turkestanite | Th(Ca,Na)2(K1-x,[]x)Si8O20·nH2O |
| turneaureite | Ca5[(As,P)O4]3Cl |
| turquoise | CuAl6(PO4)4(OH)8·4H2O |
| turquoise group | |
| tuscanite | K(Ca,Na)6(Si,Al)10O22(SO4,CO3,(OH)2)·H2O |
| tusionite | MnSn(BO3)2 |
| tuzlaite | NaCaB5O8(OH)2·3H2O |
| tvalchrelidzeite | Hg3(Sb,As)S3 |
| tvedalite | (Ca,Mn)4Be3Si6O17(OH)4·3H2O |
| tveitite-(Y) | Ca1-XYXF2+X, x~0.3 |
| twinnite | Pb(Sb,As)2S4 |
| tychite | Na6Mg2(CO3)4SO4 |
| tyretskite | Ca2B5O9OH·H2O |
| tyrolite | CaCu5(AsO4)2CO3(OH)4·6H2O |
| tyrrellite | (Cu,Co,Ni)3Se4 |
| tyuyamunite | Ca(UO2)2V2O8·5-8H2O |