Petalite
Chemical Formula	LiAlSi4O10
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	6
Specific Gravity	2.4
Color	Colorless, grey, yellow, pink, to white
Streak	Colorless
Luster	Vitreous
Refractive Index	n = 1.504 n = 1.510 n = 1.516
Diaphaneity	Transparent, Translucent
Cleavage	PerfectPerfect on poor on
Fracture	Conchoidal
Crystal Habit：Tabular prismatic crystals and columnar masses
Geological Setting：Lithium-rich pegmatites.