hexagonal
Heliodor
Be3Al2(SiO3)6:Fe3+
Quick Facts
Hardness
7.5
Specific Gravity
2.67
Refractive Index
1.577
Crystal Structure
hexagonal[6/mmm]:{10-10}@1.0 + {0001}@0.3 + {11-20}@0.2 | elongate(c:2.0) hexagonal
6/mmm
{10-10} {0001} {11-20}
Physical Properties
Crystal Systemhexagonal
Hardness (Mohs)7.5
Specific Gravity2.67
CleavageImperfect basal
FractureConchoidal to uneven
LustreVitreous
Optical Properties
Refractive Index1.577
Birefringence0.005-0.009
PleochroismWeak (pale yellow to yellow)
Dispersion0.014
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Open in Playground hexagonal[6/mmm]:{10-10}@1.0 + {0001}@0.3 + {11-20}@0.2 | elongate(c:2.0) Related Minerals
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