hexagonal Composite assembled stone
Soudé Emerald (Doublet)
Be3Al2Si6O18 (colourless beryl) + green cement
Crystal Structure
hexagonal
6/mmm
Quick Facts
Hardness
7.5
Specific Gravity
2.68
Refractive Index
1.57
Optical Character
Uniaxial -
Physical Properties
Crystal Systemhexagonal
Hardness (Mohs)7.5
Specific Gravity2.68
LustreVitreous
Optical Properties
Refractive Index1.57
Birefringence0.006
Optical CharacterUniaxial -
Origin & Identification
OriginComposite
Diagnostic FeaturesGreen colour concentrated at junction plane (visible from side in immersion), colourless crown and pavilion, green flash at junction when rocked, no dichroism in crown/pavilion sections, bubble-like inclusions in cement layer
Colours
Green (face-up only)
Common Inclusions
Green cement layer at junctionBubbles in cementColourless sections
Natural Counterpart
The natural gem this composite imitates
Related Minerals
Other minerals in the hexagonal system
