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Roger Weller, geology instructor
Chemical Group: silicate
Chemical Formula: KAlSi2O6
Color: white. light gray Streak: uncolored
Hardness: 5.5 to 6
Specific Gravity: 2.45 to 2.50
Fracture: conchoidal Cleavage: very imperfect (110)
Tenacity: brittle Transparency: translucent to opaque
Crystal Forms: Isometric system
Most common form are trapezohedrons
Mineral Associations: Leucite is found in magmas that are rich in potassium and poor in silica.
Identifying Characteristics: white trapezohedrons in volcanic rock
Occurrences: The most famous location is in the volcanics from Mt. Vesuvius, Italy.
In the USA from Wyoming and Montana
Toxicity: when-swallowed- when inhaled-