Minerals
Minerals are naturally occurring inorganic substances with a specific chemical composition and crystalline structure. They are the building blocks of rocks and are classified by their chemical composition and crystal system.
34 specimens starting with "U" (of 5,084 total)
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Udinaite
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Uklonskovite
Ulexite
Hardness: 2.5
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Ulfanderssonite-(ce)
Hardness: 5 - 6
Ulrichite
Hardness: 3 - 3.5
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Ultramarine
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Umbozerite
Hardness: 5
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Umbrianite
Hardness: 5
Umohoite
Hardness: 2
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Ungavaite
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Ungemachite
Hardness: 2.5
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Uralborite
Hardness: 4
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Uralolite
Hardness: 2.5
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Uramarsite
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Uramphite
Hardness: 2 - 3
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Urancalcarite
Hardness: 2 - 3
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Uranocirciteii
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Uranoclite
Uranopilite
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Uranosilite
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Uranospathite
Hardness: 2 - 2.5
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Uranosphaerite
Hardness: 2 - 3
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Uranotungstite
Hardness: 2
Urea
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Uricite
Hardness: 1 - 2
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Uroxite
Hardness: 2
Urusovite
Hardness: 4
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Urvantsevite
Hardness: 2
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Usovite
Hardness: 3.5
Ussingite
Hardness: 6 - 7
Utahite
Hardness: 4 - 5
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Uvanite
Uytenbogaardtite
Hardness: 2
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Uzonite
Hardness: 1.5
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