Aragonite and Chalcedony Physical Properties

Aragonite

Chalcedony

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Physical Properties

Tenacity

Brittle

Solubility

Dilute acid

Soluble

Durability

Specific Gravity

2.93-2.962.55-2.70

1 7.18

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Fracture

Subconchoidal, Conchoidal

Uneven, Splintery, Conchoidal

Cleavage

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

Absent

Mohs Hardness

3.5-46.5-7

2 10

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Chemical Composition

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

SiO₂

Aragonite and Chalcedony Chemical Formula

While comparing Aragonite and Chalcedony 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 Aragonite and Chalcedony chemical formula.

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

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Aragonite and Chalcedony Specific Gravity

Another important criteria for qualitative analysis of gemstones is Aragonite and Chalcedony Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Aragonite and Chalcedony Optical Properties during the identification of gemstone. Specific gravity of Aragonite is 2.55-2.70 whereas that of Chalcedony is 2.55-2.70.