Leucite
Chemical Formula	K[AlSi2O6]
Species	Silicates
Crystal System	Tetragonal
Mohs Scale	5-6
Specific Gravity	2.45-2.50
Color	White to grey
Luster	Vitreous
Refractive Index	n = 1.508 n = 1.509
Diaphaneity	Transparent, Translucent
Cleavage	Poor/IndistinctVery poor om
Fracture	Conchoidal
Crystal Habit：Commonly as euhedral, pseudocubic crystals; rarely granular, massive
Geological Setting：Potasium rich mafic and ultramafic lavas.