Dravite and Achroite Physical Properties

Dravite

Achroite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.03-3.182.90-3.40

1 7.18

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Fracture

Uneven, Irregular, Conchoidal

Uneven, ConchoidalWalter Schumann

Cleavage

{???} Indistinct

Indiscernible

Mohs Hardness

7-7.57-7.5

2 10

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Chemical Composition

Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

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.

Dravite and Achroite Chemical Formula

While comparing Dravite 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 Dravite and Achroite chemical formula.

Chemical formula of Dravite- Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
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.

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Dravite and Achroite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Dravite and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Achroite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 2.90-3.40 whereas that of Achroite is 2.90-3.40.