|
|
name:
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Zircon
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| gemstone variety:
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Zircon
|
| trade name 1:
|
Zircon
|
| trade name 2:
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Blue Zircon
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| trade name 3:
|
Hyacinthe
|
| basic colour:
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blue
|
|
|
Colour :
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blue, yellow, brown, orange, colourless
|
Quality :
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the intensity and the beauty of the blue colour are
important.
|
History :
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Zircon has been known since ancient times
|
Curiosities / Saga :
|
|
Countrys of Origin :
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Cambodia, Myanmar (Burma),Thailand, Ceylon, Brazil,
Madagascar, Tanzania
|
Birthstone :
|
December - Zircon
|
Hardness :
|
6.5 -7.5
|
Treatment :
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none, sometimes heated
|
Size :
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normally stones from 0.50 - 2.00 carats. Blue Zircons
of 2.00 carats or more in good quality are rare!
|
Specific gravity :
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3.90 - 4.70
|
Chemical Composition Formula :
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Zr(SiO4)
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Chemical Composition Name :
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Zirkonium-silicate
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Crystal system :
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tetragonal
|
Light refraction :
|
1.777 - 1.987
|
Double refraction :
|
0.059
|
|
|
