All minerals, synonyms and varieties beginning with letter = U.

Uakitite	Unnamed (Ba-analogue of Calcioaravaipaite)	Urancalcarite
Uchucchacuaite	Unnamed (Ba-Mn Oxalate Tetrahydrate)	Uraninite
Udinaite	Unnamed (Ca Arsenate Hydrate II)	Uranium Mica
Uduminelite	Unnamed (Ce Tungstate)	Uranmicrolite
Uedaite-(Ce)	Unnamed (Dimorph of Devilline)	Uranocircite
Uhligite	Unnamed (Eudialyte 3248)	Uranoclite
Uintahite	Unnamed (Fe2 -analogue of Brandtite)	Uranophane
UKI-2004-(OS:BiCuPb)	Unnamed (Fe2 -analogue of Lileyite)	Uranophane Group
Uklonskovite	Unnamed (Ga-dominant member of the epidote group)	Uranopilite
Ulexite	Unnamed (Gordaite-related Ca-Zn Sulphate Chloride Hydrate)	Uranopolycrase
Ulfanderssonite-(Ce)	Unnamed (Hydrated Hydrous Na-Ca-Mn-Fe-Zr-Ti Silicate Chloride)	Uranopyrochlore
Ullmannite	Unnamed (Kogarkoite-like mineral)	Uranosilite
Ulrichite	Unnamed (Mg-analogue of Batagayite)	Uranospathite
Ultrabasite	Unnamed (Mg-analogue of Hopeite)	Uranosphaerite
Ulvöspinel	Unnamed (Na-Ca-Fe-Silicate-Hydrate)	Uranospinite
Ulvöspinel subgroup	Unnamed (Na-Pb Carbonate-Hydroxide II)	Uranothorianite
UM1977-03-COSiO:CaClH	Unnamed (Na-Pb Carbonate-Hydroxide)	Uranothorite
UM1981-32-PO:FeH	Unnamed (Nd-analogue of Yttrotungstite-(Ce))	Uranotungstite
UM1983-09-S:BiPbTe	Unnamed (Orthorhombic dimorph of Barstowite)	Uransamarskite
UM1988-05-S:AgBiCuHgPb	Unnamed (P-analogue of Schultenite)	Urea
UM1988-06-S:AgBiCuHgPb	Unnamed (Partially dehydrated Arsenuranospathite)	Uricite
UM1999-38-WO:CrV	Unnamed (Pb Nitrate I)	Uroxite
UM2005-31-SiO:CuH	Unnamed (Pb Oxysulphate Hydrate)	Ursilite
Umangite	Unnamed (Pb13O8(OH)6(NO3)4)	Urusovite
Umbalite	Unnamed (Pb2(OH)3(NO3))	Urvantsevite
Umbite	Unnamed (Possible Ca-analogue of androsite-(Ce))	Ushkovite
Umbozerite	Unnamed (Possible Cr analogue of ferriallanite-(Ce))	Usovite
Umbrianite	Unnamed (possible Mn2+ analogue of Ferriakasakaite-(La)	Ussingite
Umohoite	Unnamed (Possible Mn2+ analogue of uedaite-(Ce))	Ustarasite
unassigned zeolite structure group	Unnamed (possible Mn2+ analogue of uedaite-(Nd))	Usturite
Ungarettiite (Un) amphiboles	unnamed (vacancy-rich, partially inverted spinelloid silicate)	Utahite
Ungavaite	Unnamed Pt(Cu0.67Sn0.33)	Uvanite
Ungemachite	Upalite	Uvarovite
Ungursaite	Uralborite	Uvite
unidentified	Uralite	Uytenbogaardtite
unnamed	Uralolite	Uzonite
Unnamed (Arseniosiderite-related mineral)	Uramarsite
Unnamed (Ba Thiosulphate Monohydrate)	Uramphite

All minerals by alphabet

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