Boulder Opal and Petalite Physical Properties

Boulder 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

1.98-2.252.40

1 7.18

1.5 Fracture

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

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

5-6.56-6.5

2 10

1.8 Chemical Composition

SiO 2 + H 2OUlrich Henn and Claudio C.

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

Boulder Opal and Petalite Chemical Formula

While comparing Boulder 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 Boulder Opal and Petalite chemical formula.

Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Boulder Opal Vs Chrysocolla

Boulder Opal and Petalite Specific Gravity

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