Petalite and Common Opal Physical Properties

Petalite

Common Opal

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.401.98-2.50

1 7.18

1.5 Fracture

Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal

Conchoidal, Conchoidal, Gemstones of the world (2001)

1.6 Cleavage

Perfect on {001}, poor on {201} with 38.5° angle between the two

Not Available

1.7 Mohs Hardness

6-6.55.5-6.5

2 10

1.8 Chemical Composition

LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Petalite and Common Opal Chemical Formula

While comparing Petalite and Common 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 Common Opal chemical formula.

Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

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Petalite Vs Scolecite

Petalite Vs Scheelite

Petalite Vs Sapphire

Petalite and Common Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Petalite and Common Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Petalite and Common Opal Optical Properties during the identification of gemstone. Specific gravity of Petalite is 1.98-2.50 whereas that of Common Opal is 1.98-2.50.