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orthorhombic
Chrysoberyl (Tabular Twin)
BeAl2O4
Quick Facts
Hardness
8.5
Specific Gravity
3.7
Refractive Index
1.746
Crystal Structure
orthorhombic[mmm]:{110}@1.0 + {010}@0.8 + {111}@0.5 orthorhombic
mmm
{110} {010} {111}
Physical Properties
Crystal Systemorthorhombic
Hardness (Mohs)8.5
Specific Gravity3.7
CleavageGood {110}, poor {010}
FractureConchoidal to uneven
LustreVitreous to subadamantine
Optical Properties
Refractive Index1.746
Birefringence0.008-0.010
PleochroismWeak to moderate (yellow-green, green shades)
Dispersion0.015
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