Beryl
Chemical Formula	Be3Al2(SiO3)6
Species	Silicates
Crystal System	Hexagonal
Mohs Scale	7-8
Specific Gravity	2.76
Color	Green, blue, yellow, colorless, pink and others
Streak	White
Luster	Vitreous, Sub-Vitreous, Waxy, Greasy
Refractive Index	n = 1.568 - 1.602 n = 1.564 - 1.595
Diaphaneity	Transparent to translucent
Cleavage	Imperfect/Fair
Fracture	Conchoidal
Crystal Habit：Prismatic to tabular cystals; radial, columnar; granular to compact massive
Geological Setting：Commonly found in pegmatites. Red beryl is found in topaz rhyolites.