.svg)
hexagonal
Beryl (Tabular)
Be3Al2Si6O18
Quick Facts
Hardness
7.5
Specific Gravity
2.67
Refractive Index
1.577
Crystal Structure
hexagonal[6/mmm]:{0001}@1.0 + {10-10}@0.6 + {11-20}@0.2 hexagonal
6/mmm
{0001} {10-10} {11-20}
Physical Properties
Crystal Systemhexagonal
Hardness (Mohs)7.5
Specific Gravity2.67
CleavageImperfect basal (rarely seen)
FractureConchoidal to uneven
LustreVitreous
Optical Properties
Refractive Index1.577
Birefringence0.005-0.009
PleochroismWeak to distinct (varies by variety)
Dispersion0.014
Interactive Preview
Open this crystal in the CDL Playground to rotate, export, and explore in 3D.
Open in Playground hexagonal[6/mmm]:{0001}@1.0 + {10-10}@0.6 + {11-20}@0.2 Related Minerals
Other minerals in the hexagonal system
