| Název | Chemické složení | Foto |
|---|---|---|
| udokanit | Cu3(SO4)2.H2O | |
| ugrandit | sk. vápenatých granátů | |
| uhersky dyamant | synonymum pro marmarošské diamanty | |
| uhligit | Ca3(Ti,Al,Zr)9O20(?) = perovskit | |
| uchucchacuait | AgPb3MnSb5S12 | |
| uklonskovit | NaMg(SO4)F.2H2O | |
| ulexit | NaCaB5O6(OH)6.5H2O | |
| ullmannit | NiSbS | |
| ulmit | = huminnová kyselina | |
| ulrichit | CaCu(UO2)(PO4)2.4H2O | |
| ulvöspinel | TiFe22+O4 | |
| umangit | Cu3Se2 | |
| umbit | K2ZrSi3O9.H2O | |
| umbozerit | Na3Sr4ThSi8(O,OH)24 | |
| umohoit | (UO2)MoO4.4H2O | |
| ungarettiit | NaNa2(Mn2+2Mn3+3)Si8O22O2 | |
| ungemachit | K3Na8Fe3+(SO4)6(NO3)2.6H2O | |
| ungursait | NaCa5(Ta,Nb)24O65(OH) = Na odr. kalciotantitu | |
| upalit | Al(UO2)3(PO4)2O(OH).7H2O | |
| upřen | synonymum pro ametyst | |
| uralborit | CaB2O2(OH)4 | |
| uralit | = amfibol vzniklý rozkladem pyroxenů (uralitizace) | |
| uralolit | CaBe3(PO4)2(OH)2.4H2O | |
| uramfit | (NH4)(UO2)(PO4).3H2O | |
| urancalcarit | Ca(UO2)3(CO3)(OH)6.3H2O | |
| uraninit | UO2 | |
| uranit | obecný název pro ř. autunitu a metaautunitu | |
| uranmikrolit | (U,Ca,Ce)2(Ta,Nb)2O6(OH,F) | |
| uranniobit | odrůda samarskitu | |
| uranocircit | Ba(UO2)2(PO4)2.12H2O |
|
| uranofán | Ca(UO2)2(SiO3OH)2.5H2O | |
| uranofán-á | (H3O)2Ca(UO2)2(SiO4)2.3H2O | |
| uranopilit | (UO2)6(SO4)(OH)10.12H2O |
|
| uranopyrochlor | (U,Y)(Ti,Nb,Ta)2O6 | |
| uranosférit | Bi2U2O9.3H2O | |
| uranosilit | U6+Si7O17 | |
| uranospathit | HAl(UO2)4(PO4)4.40H2O | |
| uranospinit | Ca(UO2)2(AsO4)2.10H2O | |
| uranothorit | (Th,U)[SiO4] | |
| uranotil | = uranofán | |
| uranotungstit | (Fe2+,Ba,Pb)(UO2)2(WO4)(OH)4.12H2O | |
| uranpolykras | (U,Y)(Ti,Nb,Ta)2O6 | |
| uranpyrochlor | (U,Ca,Ce)2(Nb,Ta)2O6(OH,F) | |
| urantantalit | ||
| urbanit | diopsid + egirín | |
| urea | CO(NH2)2 | |
| ureyit | = kosmochlor | |
| uricit | C5H4N4O3 | |
| ursilit | (Mg,Ca,Na2,K2)4(UO2)4(Si2O5)5.5(OH)5.13.5H2O | |
| urusovit | Cu[AlAsO5] | |
| urvantsevit | Pd(Bi,Pb)2 | |
| urvölgyit | = devillin | |
| usovit | Ba2CaMgAl2F14 | |
| ussingit | Na2AlSi3O8(OH) | |
| ustarasit | Pb(Bi,Sb)6S10 | |
| uškovit | MgFe23+(PO4)2(OH)2.8H2O | |
| utahit | Cu5Zn3(Te6+O4)4(OH)8.7H2O | |
| utreych | synonymum pro arsenolit | |
| uvanit | U26+V65+O21.15H2O(?) | |
| uvarovit | Ca3Cr2(SiO4)3 |
|
| uvit | (Ca,Na)(Mg,Fe2+)3Al5Mg(BO3)3Si6O18(OH,F)4 |
|
| uytenbogaardtit | Ag3AuS2 | |
| uzbekit | = volbortit | |
| uzonit | As4S5 |
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