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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 |
 
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Name

Formula/Composition Crystal System Hardness SG Type
  Gabbro 飛白岩/輝長岩 Main composition is Ferromagnesium minerals & Anorthite.   5-6 2.9-3.2 Rocks & Meteorites
  Gadolinite-(Y) 硅鈹釔礦 Y2FeBe2Si2O10 Monoclinic 6.5-7 4.4 Silicates
  Gahnite 鋅尖晶石 ZnAl2O4 Cubic 7.5-8 4.4-4.6 Oxides
Galena 方鉛礦 PbS Cubic 2.5 7.6 Sulphides
  Garnet 石榴石   Cubic 6.5–7.5 3.4–4.6 Silicates
Gaspeite 菱鎳礦 (Ni, Mg, Fe)CO3 Trigonal 4.5 - 5 3.7 Carbonates
  Gaudefroyite 碳硼錳鈣石/鐵方硼石 Ca4Mn3+3(BO3)3CO3(O,OH)3 Hexagonal 6 3.4 Borates
  Gaylussite 單斜納鈣石 Na2Ca(CO3)2.5H2O Monoclinic 2.5-3 2 Carbonates
  Gehlenite 鈣鋁黃長石 Ca2Al2SiO7 Tetragonal 5-6 3 Silicates
  Geocronite 斜方硫銻鉛礦 Pb14(Sb,As)6S23 Monoclinic 2.5 6.4 Sulphides
  Gneiss 片麻岩 Main composition is Feldspar、Quartz & Mica.       Rocks & Meteorites
  Germanite 鍺石/亞鍺酸鹽 Cu26Fe4Ge4S32 Cubic 4 4.5 Sulphides
  Gersdorfite 輝砷鎳礦 NiAsS Cubic 5.5 6 Sulphides
  Getchellite 硫砷銻礦 AsSbS3 Monoclinic 1.5-2 4 Sulphides
  Gibbsite 三水鋁石 Al(OH)3 Monoclinic 2.5-3.5 2.4 Oxides
  Gilalite 水矽銅石 Cu5Si6O17.7H2O Monoclinic 2 2.72-2.82 Silicates
  Gismondine 水鈣沸石 CaAl2Si2O8.4(H2O) Monoclinic 4.5 2.3 Silicates
  Glauconite 海綠石 K0,8(Al,Fe2+,Fe3+,Mg)(Si,Al)4O10(OH)2 Monoclinic 2 2.9 Silicates
Goethite 針鐵礦 Fe3+O(OH) Orthorhombic 5-5.5 4.3 Oxides
  Gold 黃金 Au Cubic 2.5-3.0
15.5-19.3 Elements
  Gonnardite 纖沸石 (Na,Ca)6-8(Al,Si)20O40.12H2O Tetragonal 4.5-5 2.3 Silicates
  Gonyerite 富錳綠泥石 (Mn,Mg)5(Fe+3)2Si3O10(OH)8 Orthorhombic 2.5 3.01 Silicates
  Goosecreekite 鵝溪沸石 CaAl2Si3O10.5H2O Monoclinic 4.5 2.2 Silicates
  Görgeyite 硫酸鉀鈣礦 K2Ca5(SO4)6.H2O Monoclinic 3.5 3 Sulfates
Goshenite 透綠柱石/無色綠柱石 Be3Al2Si6O18 Hexagonal 7.5-8 2.6 Silicates
  Granite 花崗岩 Main composition is SiO2       Rocks & Meteorites
Graphite 石墨 C Hexagonal 1-2 2.3 Elements
  Greenockite 硫鎘礦 CdS Hexagonal 3-3.5 4.8 Sulphides
Grossular 鈣鋁榴石 Ca3Al2Si3O12 Cubic 7.25 3.4-3.8 Silicates
  Gudmundite 硫銻鐵礦 FeSbS Monoclinic 5-6 7 Sulphides
Gypsum/Selenite 石膏 CaSO4.2H2O Monoclinic 1.5-2 2.3 Sulfates

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