Difference between revisions of "Aquamarine"

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! colspan=2 | Aquamarine
 
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| Chemical composition || edit me
 
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| Crystal system || edit me
 
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| Habit || edit me
 
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| Cleavage || edit me
 
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| Fracture || edit me
 
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| Hardness || edit me
 
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| Optic nature || edit me
 
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| Refraction index || edit me
 
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| Birefringence || edit me
 
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| Dispersion || edit me
 
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| Specific gravity || edit me
 
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| Lustre || edit me
 
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| Pleochroism || edit me
 
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Revision as of 23:49, 13 September 2006

Aquamarine
Chemical composition Be3Al2(SiO3)6 Beryllium aluminum silicate
Crystal system Hexagonal
Habit Prismatic
Cleavage Imperfect, basal, almost never seen
Hardness 7.5 to 8
Optic nature Uniaxial -
Refractive index 1.577-1.583
(+0.017, - 0.017)
Birefringence 0.005-0.009
Dispersion Low, 0.014
Specific gravity 2.72
(+0.18,-0.5)
Lustre Vitreous
Pleochroism Weak to moderate