Be3Al2Si6O18Hexagonal
Beryl
Be3Al2Si6O18
SilicatesChemical FormulaBe3Al2Si6O18
Crystal SystemHexagonal
Mohs Hardness7.5
Specific Gravity2.76
ColorGreen, blue, yellow, pink, colorless
LusterVitreous
StreakWhite
CleavageOne direction
FractureConchoidal to uneven
Occurrence
Found in granite pegmatites. Gem varieties: emerald (green), aquamarine (blue), morganite (pink).