Achroite and Aragonite Physical Properties

Achroite

Aragonite

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Physical Properties

Tenacity

Brittle

Solubility

Dilute acid

Durability

Specific Gravity

2.90-3.402.93-2.96

1 7.18

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Fracture

Uneven, ConchoidalWalter Schumann

Subconchoidal, Conchoidal

Cleavage

Indiscernible

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

Mohs Hardness

7-7.53.5-4

2 10

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Chemical Composition

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

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

Achroite and Aragonite Chemical Formula

While comparing Achroite 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 Achroite and Aragonite chemical formula.

Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.
Chemical formula of Aragonite- CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Achroite and Aragonite Specific Gravity

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