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Hyacinth
Hyacinth

Precious Opal
Precious Opal



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Hyacinth
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Precious Opal
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.93-4.73
Conchoidal
Indiscernible
6.5-7.5
ZrSiO 4Michael O’Donoghue , Gems, Sixth Edition (2006)
 
-
-
-
1.98-2.25
Conchoidal
None
5-6.5
SiO 2 · nH 2OGemdat.org , Management Team (2012)