White Opal and Petalite Physical Properties

White Opal

Petalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

1.98-2.502.40

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones of the world (2001)

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

1.6 Cleavage

Not Available

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

1.7 Mohs Hardness

5.5-6.56-6.5

2 10

1.8 Chemical Composition

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

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

White Opal and Petalite Chemical Formula

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

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

Compare Blue Gemstones

White Opal Vs Idocrase

White Opal Vs Kyanite

White Opal Vs Iolite

White Opal and Petalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is White Opal and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use White Opal and Petalite Optical Properties during the identification of gemstone. Specific gravity of White Opal is 2.40 whereas that of Petalite is 2.40.