Onyx and Aragonite Physical Properties

Onyx

Aragonite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Dilute acid

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.702.93-2.96

1 7.18

1.5 Fracture

Not Available

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

1.6 Cleavage

Indiscernible

Distinct on {010}, imperfect {110} and {011}

1.7 Mohs Hardness

6.5-73.5-4

2 10

1.8 Chemical Composition

SiO₂

CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Onyx and Aragonite Chemical Formula

While comparing Onyx and Aragonite 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 Aragonite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Aragonite- CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Onyx and Aragonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Aragonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Aragonite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.93-2.96 whereas that of Aragonite is 2.93-2.96.