Onyx and Brookite Physical Properties

Onyx

Brookite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.703.87-4.14

1 7.18

1.5 Fracture

Not Available

Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

1.6 Cleavage

Indiscernible

Poor on {120}, in traces on {001}

1.7 Mohs Hardness

6.5-75.5-6

2 10

1.8 Chemical Composition

SiO₂

TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Onyx and Brookite Chemical Formula

While comparing Onyx and Brookite 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 Onyx and Brookite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Brookite- TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Onyx and Brookite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Brookite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Brookite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 3.87-4.14 whereas that of Brookite is 3.87-4.14.