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leucite
noun 
  1. (mineralogy) A mineral of silica-poor igneous, plutonic and volcanic rocks. Chemically, Leucite is a potassium feldspar with insufficient silica to satisfy the chemical bonds. Because of the unfilled bonds, Leucite weathers rapidly and can only be seen as inclusions in freshly broken rock.
  • Chemical composition: Potassium aluminum subsilicate, <math>KAlSi?_2O_6</math>
  • Physical properties:
    Moh's Hardness: 5.5-6.0
    Specific gravity: 2.4-2.5
    Color: Gray to white to colorless
    Luster: Glassy, but rapidly weathers to a dull surface
    Fracture: Conchoidal
    Cleavage: Imperfect dodecahedral
  • Habit: Tetragonal-trapezohedral (pseudo-isometric)
     
 
  

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