Aragonite and Alexandrite Physical Properties

Aragonite

Alexandrite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Dilute acid

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.93-2.963.69-3.81

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

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

1,1 ; 3,2.

1.7 Mohs Hardness

3.5-48.5

2 10

1.8 Chemical Composition

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

BeAl ₂ O ₄

Aragonite and Alexandrite Chemical Formula

While comparing Aragonite and Alexandrite 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 Alexandrite chemical formula.

Chemical formula of Aragonite- CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Aragonite and Alexandrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Aragonite and Alexandrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Aragonite and Alexandrite Optical Properties during the identification of gemstone. Specific gravity of Aragonite is 3.69-3.81 whereas that of Alexandrite is 3.69-3.81.