Difference between revisions of "Template:Vanadium Beryl"
From The Gemology Project
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! colspan=2 | Emerald | ! colspan=2 | Emerald | ||
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− | | Chemical composition || Be<sub>3</sub>Al<sub>2</sub>(SiO<sub>3</sub>)<sub>6</sub> Beryllium | + | | Chemical composition || Be<sub>3</sub>Al<sub>2</sub>(SiO<sub>3</sub>)<sub>6</sub> Beryllium aluminum silicate |
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| Crystal system || [[Crystals_&_Their_Structure#Hexagonal_Crystal_System | Hexagonal]] | | Crystal system || [[Crystals_&_Their_Structure#Hexagonal_Crystal_System | Hexagonal]] |
Latest revision as of 21:24, 23 December 2006
Emerald | |
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Chemical composition | Be3Al2(SiO3)6 Beryllium aluminum silicate |
Crystal system | Hexagonal |
Habit | Prismatic |
Cleavage | Imperfect, basal |
Fracture | Conchoidal to uneven |
Hardness | 7.5 (brittle) |
Optic nature | Uniaxial - |
Refractive index | 1.566 - 1.600 |
Birefringence | 0.004 - 0.010 |
Dispersion | Low, 0.014 |
Specific gravity | 2.67 - 2.78 |
Lustre | Vitreous |
Pleochroism | Weak to distinct |