hexagonal Composite assembled stone
Soudé Emerald (Doublet)
Formula 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 System
- hexagonal
- Hardness (Mohs)
- 7.5
- Specific Gravity
- 2.68
- Lustre
- Vitreous
Optical Properties
- Refractive Index
- 1.57
- Birefringence
- 0.006
- Optical Character
- Uniaxial -
Origin & Identification
- Origin
- Composite
- Diagnostic Features
- Green 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
Characteristics
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
