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Mineral Index - U

• Uranothorianite
  var. of Thorianite
  (Th,U)O₂

• Uranothorite
  var. of Thorite
  (Th,U)SiO₄

• Uranotil
  syn. of Uranophane

• Uranotile
  syn. of Uranophane

• Uranotungstite
  Orthorhombic
  (Fe²⁺,Ba,Pb)(UO₂)₂[(OH)₄|WO₄] · 12H₂O

• Uranpecherz
  syn. of Uraninite

• Uranpyrochlor
  syn. of Uranpyrochlore

• Uranpyrochlore
  Isometric
  (U,Ca,Ce)₂(Nb,Ta)₂O₆(OH,F)

• Uranspat
  syn. of Uranospathite

• Uránszurokérc
  syn. of Uraninite

• Uranvitriol
  syn. of Johannite

• Urao
  syn. of Trona

• Urbanite
  var. of Aegirine

• Urea
  Tetragonal
  CO(NH₂)₂

• Ureyite
  syn. of Kosmochlor

• Uricite
  Monoclinic
  C₅H₄N₄O₃

• Urre
  syn. of Gold

• Ursilite
  Orthorhombic
  (Mg,Ca)₄(UO₂)₄(Si₂O₅)_5.5(OH)₅·13H₂O

• Urusite
  syn. of Sideronatrite

• Urusovite
  Monoclinic
  Cu[AlAsO₅]
• Urvantsevite
  Tetragonal
  Pd(Bi,Pb)₂

• Urvölgyite
  syn. of Devilline

• Ushkovite
  Triclinic
  MgFe³⁺₂[PO₄]₂(OH)₂ · 8H₂O

• Usonite
  syn. of Uzonite
  Monoclinic

• Usovite
  Monoclinic
  Ba₂CaMgAl₂F₁₄
• Ussingite
  Triclinic
  Na₂AlSi₃O₈OH

• Ustarasite
  Meneghinite Group
  Pb(Bi,Sb)₆S₁₀ (?)

• Üstübeç
  syn. of Cerussite

• Utahite
  Triclinic
  Cu₅Zn₃[(OH)₂|TeO₄]₄ · 7H₂O

• Utahite (of Damour)
  syn. of Hydroniumjarosite

• Utahlite
  syn. of Variscite

• Uvanite
  A secondary mineral occurring in asphaltic sandstone in a Colorado Plateau-type uranium deposit.
  Orthorhombic
  U₂V₆O₂₁·15H₂O

• Uvaroviet
  syn. of Uvarovite

• Uvaroviitti
  syn. of Uvarovite

• Uvarovitas
  syn. of Uvarovite

• Uvarovite
  Isometric
  Ca₃Cr₂[SiO₄]₃

• Uvarovite Garnet
  syn. of Uvarovite

• Uvite
  Trigonal
  [Ca][(Mg,Fe²⁺)₃][MgAl₅][(OH)₃|F|(BO₃)₃|Si₆O₁₈]
• Uytenbogaardtite
  Tetragonal
  Ag₃AuS₂

• Uzbekite
  syn. of Volborthite

• Uzonite
  Monoclinic
  As₄S₅

• Uzuminelite
  syn. of Uduminelite