Difference between revisions of "Amethyst"

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! colspan=2 | Amethyst
 
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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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| Refaction 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 22:36, 13 September 2006

Amethyst
Chemical composition Silicon dioxide SiO2
Crystal system Trigonal
Habit Prismatic
Cleavage Poor
Fracture Conchoidal
Hardness 7
Optic nature Uniaxial +
Refractive index 1.544 - 1.553
Birefringence 0.009
Dispersion Low, 0.013
Specific gravity 2.63 - 2.65
Lustre Vitreous
Pleochroism Weak to strong