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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 |
  Organic Compounds 有機物
  Name Composition Crystal System Hardness SG
  Amber 琥珀蜜蠟 Natural Plant Resin Amorphous 2-2.5 1.0-1.1
  Coral 珊瑚        
  Prescious Coral 貴珊瑚 CaCO3 Amorphous 3.5 2.65
    Black & Golden Coral 黑珊瑚和金珊瑚
Contain organic compound conchiolin & contain little
or no calcium carbonate.
Amorphous 2.5-3 1.37
  Evenkite 鱗石蠟
C24H50
Monoclinic 1 0.9
  Fichtelite 澳松石
C19H34
Monoclinic 1 1
  Ivory 牙類
Ivory is dentine form the teeth or modified teeth of certain mammals
Amorphous 2.5  
  Jet 煤晶
Jet is a form of fossilized wood. Chemical composition is carbonaceous
Amorphous 2.5-4 1.3 (approx)
  Mellite 蜜蠟石
Al2[C6(COO)6].18H2O
Tetragonal 2 1.7
  Pearl 珍珠
80% Calcium carbonate、10-14% conchiolin、2-4% water
Amorphous 2.5-3.5  
  Shell 貝殼
Mainly contain calcium carbonate plus some organic matter and water
Amorphous 2.5-3.5  
  Tortoiseshell 龜甲/玳瑁殼
Similar to other horny material which make up nailos, claws & horns
Amorphous 2.5  
  Whewellite 水草酸鈣石
CaC2O4.HO2
Monoclinic 2.5 2.2
 

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