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trigonal synthetic
Flux-Grown Ruby (Crystal)
Al2O3:Cr
Quick Facts
Hardness
9.0
Specific Gravity
3.99
Refractive Index
1.762
Crystal Structure
trigonal[-3m]:{10-10}@1.0 + {10-11}@0.8 + {0001}@0.5 trigonal
-3m
{10-10} {10-11} {0001}
Physical Properties
Crystal Systemtrigonal
Hardness (Mohs)9.0
Specific Gravity3.99
CleavageNone (parting on {0001} and {10-11})
FractureConchoidal
LustreVitreous to adamantine
Optical Properties
Refractive Index1.762
Birefringence0.008
PleochroismStrong dichroism
Dispersion0.018
Origin & Identification
Originsynthetic
Growth Methodflux
Interactive Preview
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Open in Playground trigonal[-3m]:{10-10}@1.0 + {10-11}@0.8 + {0001}@0.5 Natural Counterpart
The natural gem this synthetic imitates
Related Minerals
Other minerals in the trigonal system
