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Petalite
Petalite

Precious Opal
Precious Opal



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Petalite
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Precious Opal

Petalite and Precious Opal Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
insoluble
-
2.40
Subconchoidal, ConchoidalWalter Schumann, Conchoidal
Perfect on {001}, poor on {201} with 38.5° angle between the two
6-6.5
LiAlSi 4O 10Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
 
-
-
-
1.98-2.25
Conchoidal
None
5-6.5
SiO 2 · nH 2OGemdat.org , Management Team (2012)

Petalite and Precious Opal Chemical Formula

While comparing Petalite and Precious 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 Petalite and Precious Opal chemical formula.

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Petalite and Precious Opal Specific Gravity

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