Aragonite and Achroite Physical Properties

Aragonite

Achroite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

Brittle

Dilute acid

2.93-2.96

Subconchoidal, Conchoidal

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

3.5-4

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

2.90-3.40

Uneven, ConchoidalWalter Schumann

Indiscernible

7-7.5

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.

Aragonite and Achroite Chemical Formula

While comparing Aragonite and Achroite 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 Achroite chemical formula.

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Aragonite and Achroite Specific Gravity

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