| Definitions | noun
- (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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