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 |   Elements 元素   Name Formula Crystal System Hardness SG   Antimony 銻 Sb Trigonal 3-3.5 6.7   Arsenic 砷 As Trigonal 3.5 5.8   Arsenolamprite 自然砷鉍 As Orthorhombic 2 5.6   Bismuth 鉍 Bi Trigonal 2-2.5 9.8 Copper 天然銅 Cu Cubic 2.5-3 8.9 Diamond 鑽石 C Cubic 10 3.5   Gold 黃金 Au Cubic 2.5-3.0 15.5-19.3 Graphite 石墨 C Hexagonal 1-2 2.3   Iron 鐵 Fe Cubic 4 7.9   Lead 鉛 Pb Cubic 1.5 11.3   Mercury 汞 Hg Trigonal 13.6   Platinum 白金 Pt Cubic 4-4.5 21.5   Selenium 硒 Se Trigonal 2 4.8 Silver 銀 Ag Cubic 2.4-3.0 10-12   Stibarsen 砷銻礦 SbAs Trigonal 3-4 6.3 Sulphur 自然硫 S Orthorhombic 1.5-2.5 2.1   Tellurium 碲 Te Trigonal 2-2.5 6.2   Reference: The Complete Encyclopedia of Minerals | Gemstones of the World | 岩石與礦物圖鑑

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