Poudretteite and Topaz Physical Properties

Poudretteite

Topaz

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.51-2.533.49-3.57

1 7.18

1.5 Fracture

Conchoidal, Splintery

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

1.6 Cleavage

None

[001] Perfect

1.7 Mohs Hardness

2 10

1.8 Chemical Composition

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

Al₂SiO₄(F,OH)₂

Poudretteite and Topaz Chemical Formula

While comparing Poudretteite and Topaz 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 Poudretteite and Topaz chemical formula.

Chemical formula of Poudretteite- KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Topaz- Al₂SiO₄(F,OH)₂

Compare Violet Gemstones

Poudretteite Vs Sapphire

Poudretteite Vs Rutilated Quartz

Poudretteite Vs Rubellite

Poudretteite and Topaz Specific Gravity

Another important criteria for qualitative analysis of gemstones is Poudretteite and Topaz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Poudretteite and Topaz Optical Properties during the identification of gemstone. Specific gravity of Poudretteite is 3.49-3.57 whereas that of Topaz is 3.49-3.57.