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Aragonite
Aragonite

Opal
Opal



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Aragonite
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Opal

Aragonite and Opal Physical Properties

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
Dilute acid
-
2.93-2.96
Subconchoidal, Conchoidal
Distinct on {010}, imperfect {110} and {011}
3.5-4
CaCO 3Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
 
BrittleWalter Schumann
hot salt water
-
1.98-2.25
Conchoidal
None
5-6.5
SiO2 · nH2O

Aragonite and Opal Chemical Formula

While comparing Aragonite and Opal physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Aragonite and Opal chemical formula.

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Aragonite and Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Aragonite and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Aragonite Vs Opal during the identification of gemstone. Specific gravity of Aragonite is whereas that of Opal is .