Niob — Nb
Grundämnet Niob är ett grundämne av typen Övergångsmetall med symbolen Nb. Det har en atommassa på 92.90637 u och elektronkonfigurationen [Kr] 4d4 5s1.
Synthétique
Radioactif
Liquide
Gaz
2468°
4927°
4927°
92.90637
41
-1
2
3
4
5
2
3
4
5
Nb
2
8
18
12
1
8
18
12
1
[Kr] 4d4 5s1
1.6
6.7589
Diagram över elektronkonfiguration
egenskaper
- Atomnummer
- 41
- Atommassa
- 92.90637
- Symbol
- Nb
- Smältpunkt
- 2468
- Kokpunkt
- 4927
- Densitet
- 8.57
- Period
- 5
- Grupp
- 5
- Upptäckt
- 1801 Hatchett
- Förekomst
- 20
- Radie
- 2.1
- Elektronegativitet
- 1.6
- Jonisering
- 6.7589
- Isotop
- 24
- Elektronkonfiguration
- [Kr] 4d4 5s1
- Oxidationstillstånd
- -1,2,3,4,5
- Elektron
- 2,8,18,12,1
Niob är ett kemiskt grundämne med atomnummer 41 och symbol Nb. Den är i fast tillstånd vid rumstemperatur och har en relativt låg densitet jämfört med andra metaller. Den har en silvergrå färg och är en glänsande metall med relativt svaga mekaniska egenskaper.
niob är relativt reaktivt med luft, koldioxid och vatten. Det kan bilda stabila föreningar med syre, kväve och fluor. De kemiska egenskaperna hos niob liknar de hos andra jordalkalimetaller. Det kombineras med väte, syre, svaveldioxid och salpetersyra för att bilda oxider.
niob är en av de hårdaste och mest korrosionsbeständiga metallerna. Den är resistent mot syror, alkalier och de flesta andra organiska och oorganiska syror. Det används för att bilda legeringar med ett stort antal andra metaller, inklusive specialstål, aluminiumlegeringar och titanlegeringar.
niob används främst inom den metallurgiska industrin. Det används för tillverkning av specialstål som är resistenta mot korrosion och höga temperaturer. Det används också som tillsats i stållegeringar för att förbättra hårdheten och korrosionsbeständigheten. Det används också vid tillverkning av medicinsk utrustning, missiler och kärnbränsle. Det används också vid tillverkning av glasögon, klockor, smycken och prydnadsföremål.
Mineraler som innehåller Niob
| förnamn | Hårdhet | Densitet | Kemisk formel |
|---|---|---|---|
| Achalaite | — | 0.00 | (Fe2+,Mn)(Ti,Fe3+,Ta)(Nb,Ta)2O8 |
| Aeschynite-(Ce) | — | 5.19 | (Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6 |
| Aeschynite-(Nd) | — | 4.60 | Nd(Ti,Nb)2(O,OH)6 |
| Aeschynite-(Y) | — | 4.85 | (Y,Ca,Th)(Ti,Nb)2(O,OH)6 |
| Alluaivite | — | 2.76 | Na19(Ca,Mn2+)6(Ti,Nb)3Si26O74Cl·2H2O |
| Alsakharovite-Zn | — | 2.90 | NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4·7H2O |
| Andrianovite | — | 3.02 | Na12(K,Sr,Ce)3Ca6Mn3Zr3NbSi25O73(O,H2O,OH)5 |
| Aspedamite | — | 4.07 | 12(Fe3+,Fe2+)3Nb4[Th(Nb,Fe3+)12O42](H2O,OH)12 |
| Baotite | — | 4.42 | Ba4(Ti,Nb,W)8O16(SiO3)4Cl |
| Bariomicrolite | — | 5.68 | (Ba, )2Ta2(O,OH)7 |
| Bariopyrochlore | — | 4.00 | Ba2Nb2O7 |
| Barytolamprophyllite | — | 3.62 | Na3(BaK)Ti3(Si2O7)2O2(OH)2 |
| Batisivite | — | 4.62 | BaTi6(V,Cr)8Si2O29 |
| Béhierite | — | 7.81 | TaBO4 |
| Belkovite | — | 4.16 | Ba3Nb6(Si2O7)2O12 |
| Belyankinite | — | 2.32 | Ca1-2(Ti,Zr,Nb)5O12·9H2O |
| Billwiseite | — | 6.33 | Sb3+5Nb3WO18 |
| Bismutocolumbite | — | 7.56 | BiNbO4 |
| Bismutomicrolite | — | 6.83 | (Bi,Ca)2Ta2(O,OH)7 |
| Bismutopyrochlore | — | 4.97 | (Bi,U,Ca,Pb)1+xNb2O6(OH)·nH2O |
| Bismutotantalite | — | 8.51 | BiTaO4 |
| Bobshannonite | — | 3.79 | Na2KBa(Mn,Na)8(Nb,Ti)4(Si2O7)4O4(OH)4(O,F)2 |
| Bobtraillite | — | 3.16 | (Na,Ca)13Sr11(Zr,Y,Nb)14Si42B6O132(OH)12·12H2O |
| Bornemanite | — | 3.47 | Na6BaTi2Nb(Si2O7)2(PO4)O2(OH)F |
| Burovaite-Ca | — | 2.73 | (Na,K)4Ca2(Ti,Nb)8[Si4O12]4(OH,O)8·12H2O |
| Bykovaite | — | 2.98 | (Ba,Na,K)2(Na,Ti,Mn)4(Ti,Nb)2O2Si4O14(H2O,F,OH)2·3.5H2O |
| Byzantievite | — | 4.25 | Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4(PO4,SiO4)4(BO3)9O22[(OH),F]43·1.5H2O |
| Calciobetafite | — | 4.20 | (Ca,Na)2(Nb,Ti)2(O,OH)7 |
| Calciomurmanite | — | 2.85 | (Na)2Ca(Ti,Mg,Nb)4[Si2O7]2O2(OH,O)2(H2O)4 |
| Calciosamarskite | — | 4.48 | (Ca,Fe,Y)(Nb,Ta,Ti)O4 |
| Calciotantite | — | 7.46 | CaTa4O11 |
| Carbokentbrooksite | — | 3.14 | (Na)12(Na,Ce)3Ca6Mn3Zr3NbSi25O73(OH)3(CO3)·H2O |
| Carlosbarbosaite | — | 4.00 | (UO2)2Nb2O6(OH)2·2H2O |
| Ceriopyrochlore-(Ce) | — | 4.13 | (Ca,Ce,Y,Na)2Nb2(O,OH,F)7 |
| Cesplumtantite | — | 6.00 | Cs2Pb3Ta8O24 |
| Changbaiite | — | 6.48 | PbNb2O6 |
| Charleshatchettite | — | 0.00 | CaNb4O10(OH)2·8H2O |
| Chivruaiite | — | 2.40 | Ca4(Ti,Nb)5(Si6O17)2(OH,O)5·13-14H2O |
| Columbite-(Fe) | — | 5.30 | Fe2+Nb2O6 |
| Columbite-(Mg) | — | 5.04 | MgNb2O6 |
| Columbite-(Mn) | — | 5.28 | Mn2+Nb2O6 |
| Dingdaohengite-(Ce) | — | 4.83 | (Ce3+,La)4Fe2+(Ti,Fe2+,Mg,Fe3+)2Ti2Si4O22 |
| Diversilite-(Ce) | — | 3.68 | Na2Ba6Ce2Fe2+Ti3Si12O36(OH)10·nH2O |
| Dovyrenite | — | 3.03 | Ca6Zr(Si2O7)2(OH)4 |
| Dualite | — | 2.84 | Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3MnSi51O144(OH,H2O,Cl)9 |
| Edgarite | — | 4.99 | FeNb3S6 |
| Ekplexite | — | 3.63 | (Nb,Mo,W)S2·(Mg1-xAlx)(OH)2+x |
| Epistolite | — | 2.65 | Na4TiNb2(Si2O7)2O2(OH)2·4H2O |
| Euxenite-(Y) | — | 4.70 | (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 |
| Eveslogite | — | 2.85 | (Ca,K,Na,Sr,Ba)48(Ti,Nb,Fe,Mn)12(OH)12Si48O144(OH,F,Cl)14 |
| Faizievite | — | 2.82 | Li6K2Na(Ca6Na)Ti4(Si6O18)2(Si12O30)F2 |
| Feklichevite | — | 2.87 | Na11Ca9(Fe3+,Fe2+)2Zr3Nb(Si25O73)(OH,H2O,Cl,O)5 |
| Fergusonite-(Ce) | — | 5.48 | CeNbO4·0.3H2O |
| Fergusonite-(Ce)- | — | 0.00 | CeNbO4 |
| Fergusonite-(Nd) | — | 4.50 | NdNbO4 |
| Fergusonite-(Nd)- | — | 0.00 | NdNbO4 |
| Fergusonite-(Y) | — | 4.30 | YNbO4 |
| Fergusonite-(Y)- | — | 0.00 | YNbO4 |
| Ferrokentbrooksite | — | 3.06 | Na15Ca6Fe2+3Zr3Nb(Si25O73)(O,OH,H2O)3(F,Cl)2 |
| Fersmanite | — | 3.44 | Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 |
| Fersmite | — | 4.69 | (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 |
| Fluorcalciopyrochlore | — | 0.00 | (Ca,Na)2(Nb,Ti)2O6F |
| Fluornatropyrochlore | — | 5.28 | (Na,Pb,Ca,REE,U)2Nb2O6F |
| Foordite | — | 6.73 | Sn2+Nb2O6 |
| Franconite | — | 2.72 | NaNb2O5(OH)·3H2O |
| Georgbarsanovite | — | 3.05 | Na12(Mn,Sr,REE)3Ca6Fe2+3Zr3NbSi25O76Cl2·H2O |
| Gerasimovskite | — | 2.52 | Mn2+(Ti,Nb)5O12·9H2O |
| Gjerdingenite-Ca | — | 2.79 | K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·6H2O |
| Gjerdingenite-Fe | — | 2.82 | K2Fe(Nb,Ti)4(Si4O12)2(O,OH)4·6H2O |
| Gjerdingenite-Mn | — | 2.93 | K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4·6H2O |
| Gjerdingenite-Na | — | 2.71 | (K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4·5H2O |
| Golyshevite | — | 2.89 | Na10Ca9Zr3Fe2SiNb(Si3O9)2(Si9O27)2(OH)3(CO3)·H2O |
| Gramaccioliite-(Y) | — | 4.66 | (Pb,Sr)(Y,Mn)Fe3+2(Ti,Fe3+)18O38 |
| Gutkovaite-Mn | — | 2.83 | CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4·5H2O |
| Haineaultite | — | 2.28 | (Na,Ca)5Ca(Ti,Nb)5Si12O34(OH,F)8·5H2O |
| Hochelagaite | — | 2.85 | CaNb4O11·8H2O |
| Hydroastrophyllite | — | 3.15 | (H3O,K)2CaFe2+5-6Ti2Si8O26(OH)4F |
| Hydropyrochlore | — | 0.00 | (H2O)2Nb2(O,OH)6(H2O) |
| Hydroxycalciopyrochlore | — | 5.15 | (Ca,Na,U)2(Nb,Ti)2O6(OH) |
| Hydroxymanganopyrochlore | — | 5.40 | (Mn,Th,Na,Ca,REE)2(Nb,Ti)2O6(OH) |
| Ikranite | — | 2.82 | (Na,H3O)15(Ca,Mn,REE)6Fe3+2Zr3Si24O66(O,OH)6Cl·nH2O |
| Ilímaussite-(Ce) | — | 3.60 | (Ba,Na)10K3Na4.5Ce5(Nb,Ti)6O6(Si12O36)(Si9O18)(O,OH)24 |
| IMA2015-067 | — | 0.00 | Ca2Mn2Nb6O19·20H2O |
| Intersilite | — | 2.42 | Na6Mn(Ti,Nb)Si10(O,OH)28·4H2O |
| Irtyshite | — | 7.03 | Na2Ta4O11 |
| Ishikawaite | — | 6.20 | (U,Fe,Y)NbO4 |
| Isolueshite | — | 4.72 | NaNbO3 |
| Iwashiroite-(Y) | — | 7.10 | YTaO4 |
| Ixiolite | — | 6.94 | (Ta,Mn,Nb)O2 |
| Janhaugite | — | 3.60 | (Na,Ca)3(Mn2+,Fe2+)3(Ti,Zr,Nb)2(Si2O7)2O2(OH,F)2 |
| Jedwabite | — | 8.60 | Fe7Ta3 |
| Jinshajiangite | — | 3.61 | NaBaFe2+4Ti2(Si2O7)2O2(OH)2F |
| Joaquinite-(Ce) | — | 3.62 | NaBa2Fe2+Ti2Ce2(SiO3)8O2(OH)·H2O |
| Johnsenite-(Ce) | — | 3.20 | Na12Ce3Ca6Mn3Zr3WSi25O73(CO3)(OH)2 |
| Johnwalkite | — | 3.40 | K(Mn2+,Fe3+)2(Nb,Ta)O2(PO4)2·2(H2O,OH) |
| Karnasurtite-(Ce) | — | 2.89 | CeTiAlSi2O7(OH)4·3H2O |
| Karupmøllerite-Ca | — | 2.71 | (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·7H2O |
| Kaskasite | — | 3.83 | (Mo,Nb)S2·(Mg1-xAlx)(OH)2+x |
| Kazanskyite | — | 2.93 | BaNa3Ti2Nb(Si2O7)2O2(OH)2·4H2O |
| Kentbrooksite | — | 3.07 | (Na,REE)15(Ca,REE)6Mn3Zr3NbSi25O73(O,OH,H2O)3(F,Cl)2 |
| Kobeite-(Y) | — | 4.60 | (Y,U)(Ti,Nb)2(O,OH)6 |
| Kochite | — | 3.32 | Na(Na,Ca)2Ca2(Mn,Ca)ZrTi(Si2O7)2(F,O)4 |
| Komarovite | — | 3.61 | (Ca,Sr,Na)6-x(Nb,Ti)6(Si4O12)(O,OH,F)16·nH2O |
| Koragoite | — | 4.70 | Mn2+2Mn3+Nb2(Nb,Ta)3W2O20 |
| Korobitsynite | — | 0.00 | (Na)8Ti4(Si4O12)2(O,OH)4·8H2O |
| Kupletskite | — | 3.20 | K2NaMn2+7Ti2(Si4O12)2O2(OH)4F |
| Kupletskite-(Cs) | — | 3.68 | Cs2NaMn2+7Ti2(Si4O12)2O2(OH)4F |
| Kuzmenkoite-Mn | — | 2.67 | K4Mn2Ti8(Si4O12)4(OH,O)8·10-12H2O |
| Kuzmenkoite-Zn | — | 2.78 | K2ZnTi4(Si4O12)2(OH)4·6-8H2O |
| Laachite | — | 5.42 | (Ca,Mn)2Zr2Nb2TiFeO14 |
| Labuntsovite-Fe | — | 2.94 | Na4K4Fe2+2Ti8(Si4O12)4(O,OH)8·10-12H2O |
| Labuntsovite-Mg | — | 2.88 | Na4K4Mg2Ti8O4(Si4O12)4(OH)4·10-12H2O |
| Labuntsovite-Mn | — | 2.89 | Na4K4Mn2+2Ti8O4(Si4O12)4(OH)4·10-12H2O |
| Lakargiite | — | 4.59 | CaZrO3 |
| Landauite | — | 4.42 | (Na,Pb)(Mn2+,Y)(Zn,Fe)2(Ti,Fe3+,Nb)18(O,OH,F)O38 |
| Latrappite | — | 4.40 | Ca2NbFe3+O6 |
| Laurentianite | — | 2.46 | Na3Nb3Si4O17·9H2O |
| Låvenite | — | 3.51 | (Na,Ca)2(Mn2+,Fe2+)(Zr,Ti,Nb)(Si2O7)(O,OH,F)2 |
| Lemmleinite-Ba | — | 3.03 | Na4K4Ba2+xTi8(Si4O12)4(O,OH)8·8H2O |
| Lemmleinite-K | — | 2.80 | Na4K8Ti8(Si4O12)4(O,OH)8·8H2O |
| Lemoynite | — | 2.29 | Na2CaZr2Si10O26·5-6H2O |
| Lepkhenelmite-Zn | — | 2.96 | Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4·7H2O |
| Liandratite | — | 6.80 | U6+Nb2O8 |
| Lithiotantite | — | 7.00 | LiTa3O8 |
| Loparite-(Ce) | — | 4.77 | (Na,Ce,Sr)(Ce,Th)(Ti,Nb)2O6 |
| Lueshite | — | 4.44 | NaNbO3 |
| Makarochkinite | — | 3.93 | Ca2Fe2+4Fe3+TiSi4BeAlO20 |
| Manganbelyankinite | — | 2.40 | Mn2+(Ti,Nb)5O12·9H2O |
| Manganokaskasite | — | 4.09 | (Mo,Nb)S2·(Mn1-xAlx)(OH)2+x |
| Manganokukisvumite | — | 2.86 | Na6MnTi4Si8O28·4H2O |
| Maoniupingite-(Ce) | — | 0.00 | (Ce,Ca)4(Fe3+,Ti,Fe2+)(Ti,Fe3+,Fe2+,Nb)4Si4O22 |
| Marianoite | — | 3.32 | Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 |
| Melcherite | — | 0.00 | Ba2Na2MgNb6O19·6H2O |
| Menezesite | — | 4.18 | Ba3MgZr4Nb12O42·12H2O |
| Mogovidite | — | 2.90 | Na9(Ca,Na)12Fe2Zr3Si25O72(CO3)(OH)4 |
| Mongolite | — | 3.15 | Ca4Nb6Si5O24(OH)10·6H2O |
| Mosandrite | — | 3.29 | (Ca,Ce)4(Ca,Na)3Ti(Si2O7)2(H2O,OH,F)4·H2O |
| Murataite-(Y) | — | 4.00 | (Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4 |
| Murmanite | — | 2.64 | Na2Ti2(Si2O7)O2·2H2O |
| Nacareniobsite-(Ce) | — | 3.45 | Na3Ca3CeNb(Si2O7)2OF3 |
| Nalivkinite | — | 3.29 | Li2NaFe2+7Ti2(Si4O12)2O2(OH)4F |
| Natrobistantite | — | 6.10 | NaBi(Ta,Nb,Sb)4(O,OH)12 |
| Natrokomarovite | — | 3.30 | (Na,Ca)6-xCa(Nb,Ti)6Si4O12(O,OH,F)16·nH2O |
| Natrolemoynite | — | 2.47 | Na4Zr2Si10O26·9H2O |
| Natroniobite | — | 4.40 | NaNbO3 |
| Nechelyustovite | — | 3.32 | (Ba,Na)2(Na,Ti,Mn)4(Ti,Nb)2Si4O14(OH,O,F)5·3H2O |
| Nenadkevichite | — | 2.84 | (Na)8Nb4(Si4O12)2(O,OH)4·8H2O |
| Neskevaaraite-Fe | — | 2.88 | NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4·6H2O |
| Nioboaeschynite-(Ce) | — | 5.04 | (Ce,Ca)(Nb,Ti)2(O,OH)6 |
| Nioboaeschynite-(Nd) | — | 0.00 | Nd(Nb,Ti)2(O,OH)6 |
| Nioboaeschynite-(Y) | — | 5.34 | (Y,REE,Ca,Th,Fe)(Nb,Ti,Ta)2(O,OH)6 |
| Niobocarbide | — | 10.25 | NbC |
| Nioboholtite | — | 3.72 | (Nb0.60.4)Al6BSi3O18 |
| Niobokupletskite | — | 3.33 | K2NaMn2+7(Nb,Zr,Ti)(Si4O12)2O2(OH)4(O,F) |
| Niobophyllite | — | 3.42 | K2NaFe2+7(Nb,Ti)(Si4O12)2O2(OH)4(O,F) |
| Niocalite | — | 3.32 | Ca7Nb(Si2O7)2O3F |
| Normandite | — | 3.48 | NaCa(Mn,Fe)(Ti,Nb,Zr)(Si2O7)OF |
| Olmsteadite | — | 3.31 | KFe2+2NbO2(PO4)2·2H2O |
| Oneillite | — | 3.20 | Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 |
| Organovaite-Mn | — | 2.88 | K2MnNb4(Si4O12)2O4·5-7H2O |
| Organovaite-Zn | — | 2.88 | K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4·6H2O |
| Orthojoaquinite-(La) | — | 4.10 | NaBa2La2Fe2+Ti2Si8O26(OH,O,F)·H2O |
| Oxycalciobetafite | — | 0.00 | Ca2(Ti,Nb)2O6O |
| Oxycalciopyrochlore | — | 5.10 | Ca2Nb2O6O |
| Oxynatromicrolite | — | 6.51 | (Na,Ca,U)2(Ta,Nb)2O6(O,F) |
| Oxyuranobetafite | — | 0.00 | (U,Ca)2(Ti,Nb)2O6O |
| Parakuzmenkoite-Fe | — | 3.00 | (K,Ba)8Fe4Ti16(Si4O12)8(OH,O)16·20-28H2O |
| Paratsepinite-Ba | — | 2.88 | (Ba,Na,K)2-x(Ti,Nb)2Si4O12(OH,O)2·4H2O |
| Paratsepinite-Na | — | 0.00 | (Na,Sr,K,Ca)2(Ti,Nb)2(Si4O12)(O,OH)2·4H2O |
| Pauloabibite | — | 4.25 | NaNbO3 |
| Perraultite | — | 3.71 | (Na,Ca)2(Ba,K)2(Mn,Fe)8(Ti,Nb)4O4(OH)2(Si2O7)4(OH,F)4 |
| Peterandresenite | — | 3.05 | Mn4Nb6O19·14H2O |
| Petscheckite | — | 5.50 | U4+Fe2+Nb2O8 |
| Phosphoinnelite | — | 3.82 | Na3Ba4Ti3Si4O14(PO4)2O2F |
| Písekite-(Y) | — | 4.03 | (Y,As,Ca,Fe,U)(Nb,Ti,Ta)O4 |
| Plumbobetafite | — | 4.64 | (Pb,U,Ca)2(Ti,Nb)2(O,OH,F)7 |
| Plumbopyrochlore | — | 5.04 | (Pb,Y,U,Ca)2Nb2(O,OH)7 |
| Polyakovite-(Ce) | — | 4.75 | (Ce,Ca)4MgCr2(Ti,Nb)2Si4O22 |
| Polycrase-(Y) | — | 4.97 | Y(Ti,Nb)2(O,OH)6 |
| Pyrochlore | — | 4.20 | Ca2Nb2O7 |
| Qitianlingite | — | 6.42 | Fe2+2Nb2W6+O10 |
| Rankamaite | — | 5.50 | (Na,K,Pb)(Ta,Nb,Al)4(O,OH)10 |
| Raslakite | — | 2.95 | Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)Si25O73(OH,H2O)3(Cl,OH) |
| Rinkite | — | 3.50 | Na2Ca4CeTi(Si2O7)2OF3 |
| Rippite | — | 0.00 | K2(Nb,Ti)2(Si4O12)O(O,F) |
| Rossovskyite | — | 6.30 | (Fe3+,Ta)(Nb,Ti)O4 |
| Roumaite | — | 3.33 | (Ca,Na,Ce)7(Nb,Ti)(Si2O7)2(OH)F3 |
| Rynersonite | — | 6.40 | CaTa2O6 |
| Saamite | — | 3.24 | BaNa3Ti2Nb(Si2O7)2O2(OH)2·2H2O |
| Samarskite-(Y) | — | 5.60 | (Y,Ce,U,Fe,Nb)(Nb,Ta,Ti)O4 |
| Samarskite-(Yb) | — | 7.03 | YbNbO4 |
| Schiavinatoite | — | 6.55 | NbBO4 |
| Shcherbakovite | — | 3.34 | K2NaTi4+2(Si4O12)O(OH) |
| Shkatulkalite | — | 2.70 | Na10MnTi3Nb3(Si2O7)6(OH)2F·12H2O |
| Simpsonite | — | 6.70 | Al4Ta3O13(OH) |
| Sitinakite | — | 2.86 | KNa2Ti4Si2O13(OH)·4H2O |
| Sobolevite | — | 3.03 | Na13Ca2Mn2Ti3(Si2O7)2(PO4)4O3F3 |
| Sosedkoite | — | 6.90 | K5Al2Ta22O60 |
| Stibiocolumbite | — | 5.98 | SbNbO4 |
| Strontiopyrochlore | — | 3.80 | Sr0.6Nb2(O,OH)7 |
| Surkhobite | — | 3.84 | NaCaBa2Mn8Ti4O4(Si2O7)4(F5O) |
| Tantalaeschynite-(Y) | — | 5.75 | Y(Ta,Ti,Nb)2O6 |
| Tantalite-(Mg) | — | 6.70 | MgTa2O6 |
| Tanteuxenite-(Y) | — | 5.40 | Y(Ta,Nb,Ti)2(O,OH)6 |
| Tapiolite-(Fe) | — | 7.82 | Fe2+Ta2O6 |
| Tapiolite-(Mn) | — | 7.72 | Mn2+Ta2O6 |
| Taseqite | — | 3.24 | Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 |
| Tazzoliite | — | 4.49 | Ba4-xNaxTi2Nb3SiO17[PO2(OH)2]x(OH)1-2x; (0=x=0.5) |
| Ternovite | — | 2.95 | MgNb4O11·8-12H2O |
| Thoriopyrochlore | — | 0.00 | (Ca,Th,Na,Ce)2(Nb,Zr,Ti,Fe)2(O,OH,F)7 |
| Titanowodginite | — | 6.86 | Mn2+TiTa2O8 |
| Tsepinite-Ca | — | 2.73 | (Ca,K,Na)2-x(Ti,Nb)2Si4O12(OH,O)2·4H2O |
| Tsepinite-K | — | 2.88 | (K,Ba,Na)2(Ti,Nb)2Si4O12(OH,O)2·3H2O |
| Tsepinite-Na | — | 2.74 | (Na,H3O,K,Sr,Ba)12Ti8(Si4O12)4(OH,O)8·12-16H2O |
| Tsepinite-Sr | — | 2.67 | (Sr,Ba,K)(Ti,Nb)2Si4O12(OH,O)2·3H2O |
| Tundrite-(Ce) | — | 4.08 | Na2Ce2TiO2SiO4(CO3)2 |
| Tundrite-(Nd) | — | 3.70 | Na2Nd2TiO2(SiO4)(CO3)2 |
| Uranmicrolite | — | 5.75 | (U,Ca,Ce)2Ta2(O,OH,F)7 |
| Uranopolycrase | — | 5.50 | (U,Y)(Ti,Nb,Ta)2(O,OH)6 |
| Uranpyrochlore | — | 4.80 | (Ca,U,Na,Ce)2Nb2(O,OH,F)7 |
| Veblenite | — | 3.05 | K22Na(Fe2+5Fe3+4Mn2+7)Nb3Ti(Si2O7)2(Si8O22)2O6(OH)10·3H2O |
| Vigezzite | — | 5.54 | (Ca,Ce)(Nb,Ta,Ti)2O6 |
| Vinogradovite | — | 2.88 | Na4Ti4(Si2O6)2[(Si,Al)4O10]O4·(H2O,Na,K)3 |
| Voronkovite | — | 2.97 | Na15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl·H2O |
| Vuonnemite | — | 3.13 | Na11Ti4+Nb2(Si2O7)2(PO4)2O3F |
| Vuoriyarvite-K | — | 2.95 | (K,Na)12Nb8(Si4O12)4O8·12-16H2O |
| Wodginite | — | 7.19 | Mn2+Sn4+Ta2O8 |
| Wöhlerite | — | 3.42 | NaCa2(Zr,Nb)(Si2O7)(O,F)2 |
| Yttrobetafite-(Y) | — | 3.65 | (Y,U,Ce)2(Ti,Nb,Ta)2(O,OH)7 |
| Yttrocolumbite-(Y) | — | 5.70 | (Y,U,Fe2+)(Nb,Ta)O4 |
| Yttropyrochlore-(Y) | — | 3.60 | (Y,Na,Ca)2Nb2(O,OH)7 |
| Yttrotantalite-(Y) | — | 5.50 | (Y,U,Fe2+)(Ta,Nb)2(O,OH)4 |
| Yuksporite | — | 3.05 | K4(Ca,Na)14(Sr,Ba)2(Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3 |
| Zabinskiite | — | 3.90 | Ca[Al0.5(Ta,Nb)0.5](SiO4)O |
| Zimbabweite | — | 6.20 | Na(Pb,Na,K)2(Ta,Nb,Ti)4As4O18 |
| Zirconolite | — | 4.80 | (Ca,Y)Zr(Ti,Mg,Al)2O7 |
| Zirconolite-3O | — | 4.70 | (Ca,Fe,Y,Th)2Fe(Ti,Nb)3Zr2O14 |
| Zircophyllite | — | 3.34 | K2NaMn2+7Zr2(Si4O12)2O2(OH)4F |
| Zirkelite | — | 4.70 | (Ti,Ca,Zr)O2-x |
| Zirsilite-(Ce) | — | 3.15 | (Na)12(Ce,Na)3Ca6Mn3Zr3NbSi25O73(OH)3(CO3)·H2O |
| Zvyaginite | — | 2.94 | NaZnNb2Ti[Si2O7]2O(OH,F)3(H2O)4+x, where (x < 1) |