hexagonal
Emerald
Be3Al2(SiO3)6:Cr
Quick Facts
Hardness
7.5
Specific Gravity
2.72
Refractive Index
1.577
Crystal Structure
hexagonal[6/mmm]:{10-10}@1.0 + {0001}@0.8 | elongate(c:1.5) hexagonal
6/mmm
{10-10} {0001}
Physical Properties
Crystal Systemhexagonal
Hardness (Mohs)7.5
Specific Gravity2.72
CleavageIndistinct {0001}
FractureConchoidal to uneven
LustreVitreous
Optical Properties
Refractive Index1.577
Birefringence0.006
PleochroismDistinct (blue-green/yellow-green)
Dispersion0.014
Interactive Preview
Open this crystal in the CDL Playground to rotate, export, and explore in 3D.
Open in Playground hexagonal[6/mmm]:{10-10}@1.0 + {0001}@0.8 | elongate(c:1.5) Related Minerals
Other minerals in the hexagonal system
