Dravite and Poudretteite Physical Properties

Dravite

Poudretteite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.03-3.182.51-2.53

1 7.18

1.5 Fracture

Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

Conchoidal, Splintery

1.6 Cleavage

{???} Indistinct

None

1.7 Mohs Hardness

7-7.55

2 10

1.8 Chemical Composition

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

KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)

Dravite and Poudretteite Chemical Formula

While comparing Dravite and Poudretteite 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 Poudretteite 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 Poudretteite- KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)

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Dravite and Poudretteite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Dravite and Poudretteite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Poudretteite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 2.51-2.53 whereas that of Poudretteite is 2.51-2.53.