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hexagonal
Beryl (Hexagonal Prism)
Be3Al2Si6O18
Quick Facts
Hardness
7.5
Specific Gravity
2.67
Refractive Index
1.577
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
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
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