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  Elements | Sulphides | Halides | Oxides | Carbonates | Borates | Sulfates |
  Phosphates | Silicates | Organic Compounds | Rocks & Meteorites
  
 A |
B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T |  U | V | W | X | Y | Z |
 
日月星水晶屋 Sun Moon Star Crystal House  U 日月星水晶屋 Sun Moon Star Crystal House
  Name
Formula/Composition Crystal System Hardness SG Type
  Ugrandite Series 鈣榴石系列   Cubic 6.5-7.25 3.4-3.9 Silicates
Ulexite 硼鈉鈣石/電視石 NaCaB5O6(OH)6.5H2O Triclinic 2.5 2 Sulfates
  Ullmanite 銻硫鎳礦 NiSbS Cubic 5-5.5 6.8 Sulphides
  Umangite 紅硒銅礦 Cu3Se2 Tetragonal 3 6.6 Sulphides
  Uraninite 方鈾礦 UO2 Cubic 5-6 7.5-10.6 Oxides
  Uranocircite 鋇鈾雲母 Ba(UO2)2(PO4)2.10H2O Tetragonal 2-2.5 3.5 Phosphates
  Uranophane 矽鈣鈾礦 Ca(UO2)2Si2O7.6H2O Monoclinic 2.5 3.9 Silicates
  Utrabasic 超基性火成岩         Rocks & Meteorites
Uvarovite 鈣鉻榴石 Ca3Cr2Si3O12 Cubic 6.5-7 3.9 Silicates
  Uvite 鈣鎂電氣石 CaMg4Al5(BO3)3Si6O18(OH,F)4 Trigonal 7-7.5 3.3 Silicates
 
 

Reference:
The Complete Encyclopedia of Minerals |
Gemstones of the World | 岩石與礦物圖鑑
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