| Uchucchacuaite (A) | Uralolite (G) | Uranpyrochlore (R) |
| Uhligite (Q) | Uramphite (G) | Urea (A) |
| Uklonskovite (G) | Urancalcarite (A) | Uricite (A) |
| Ulexite (G) | Uraninite (G) | Ursilite (G) |
| Ullmannite (G) | Uranmicrolite (R) | Urusovite (A) |
| Ulrichite (A) | Uranocircite (G) | Urvantsevite (A) |
| Ulvöspinel (G) | Uranophane (G) | Ushkovite (A) |
| Umangite (G) | Uranophane-beta (G) | Usovite (A) |
| Umbite (A) | Uranopilite (G) | Ussingite (G) |
| Umbozerite (A) | Uranopolycrase (A) | Ustarasite (Q) |
| Umohoite (G) | Uranosilite (A) | Utahite (A) |
| Ungarettiite (A) | Uranospathite (G) | Uvanite (Q) |
| Ungemachite (G) | Uranosphaerite (G) | Uvarovite (G) |
| Upalite (A) | Uranospinite (G) | Uvite (G) |
| Uralborite (G) | Uranotungstite (A) | Uytenbogaardtite (A) |
| Uzonite (A) | ||