niobium — Nb
Het chemische element niobium is een element van het type Metaalactiniden met symbool Nb. Het heeft een atoommassa van 92.90637 u en een elektronenconfiguratie [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 van elektronenconfiguratie
kenmerken
- Atoomnummer
- 41
- Atoommassa
- 92.90637
- Symbool
- Nb
- Smeltpunt
- 2468
- Kookpunt
- 4927
- Dichtheid
- 8.57
- Periode
- 5
- Groep
- 5
- Ontdekking
- 1801 Hatchett
- Overvloed
- 20
- Straal
- 2.1
- Elektronegativiteit
- 1.6
- Ionisatie
- 6.7589
- Isotoop
- 24
- Elektronenconfiguratie
- [Kr] 4d4 5s1
- Oxidatietoestand
- -1,2,3,4,5
- Elektron
- 2,8,18,12,1
Niobium is een scheikundig element met atoomnummer 41 en symbool Nb. Het is in vaste toestand bij kamertemperatuur en heeft een relatief lage dichtheid in vergelijking met andere metalen. Het heeft een zilvergrijze kleur en is een glanzend metaal met relatief zwakke mechanische eigenschappen.
niobium is relatief reactief met lucht, koolstofdioxide en water. Het kan stabiele verbindingen vormen met zuurstof, stikstof en fluor. De chemische eigenschappen van niobium zijn vergelijkbaar met die van andere aardalkalimetalen. Het combineert met waterstof, zuurstof, zwaveldioxide en salpeterzuur om oxiden te vormen.
niobium is een van de hardste en meest corrosiebestendige metalen. Het is bestand tegen zuren, basen en de meeste andere organische en anorganische zuren. Het wordt gebruikt om legeringen te vormen met een groot aantal andere metalen, waaronder speciale staalsoorten, aluminiumlegeringen en titaniumlegeringen.
niobium wordt voornamelijk gebruikt in de metallurgische industrie. Het wordt gebruikt voor de productie van speciaal staal dat bestand is tegen corrosie en hoge temperaturen. Het wordt ook gebruikt als additief in staallegeringen om de hardheid en corrosieweerstand te verbeteren. Het wordt ook gebruikt bij de vervaardiging van medische apparatuur, raketten en nucleaire brandstof. Het wordt ook gebruikt bij de productie van brillen, horloges, sieraden en decoratieve artikelen.
Mineralen die niobium bevatten
| voornaam | Hardheid | Dichtheid | Chemische formule |
|---|---|---|---|
| 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) |