hexagonal
Beryl
Be3Al2Si6O18
Quick Facts
Hardness
7.5-8
Specific Gravity
2.67-2.78
Refractive Index
1.577-1.583
Crystal Structure
hexagonal[6/mmm]:{10-10}@1.0 + {0001}@1.0 hexagonal
6/mmm
{10-10} {0001}
Physical Properties
Crystal Systemhexagonal
Hardness (Mohs)7.5-8
Specific Gravity2.67-2.78
CleavageImperfect basal (rarely seen)
FractureConchoidal to uneven
LustreVitreous
Optical Properties
Refractive Index1.577-1.583
Birefringence0.005-0.009
PleochroismWeak to distinct (varies by variety)
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Open in Playground hexagonal[6/mmm]:{10-10}@1.0 + {0001}@1.0 Related Minerals
Other minerals in the hexagonal system