Sillimanite and Beryllonite Physical Properties

Sillimanite

Beryllonite

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.262.79-2.87

1 7.18

1.5 Fracture

Splintery

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal

1.6 Cleavage

{010} perfect

{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces

1.7 Mohs Hardness

6-7.55.5-6

2 10

1.8 Chemical Composition

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Sillimanite and Beryllonite Chemical Formula

While comparing Sillimanite and Beryllonite 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 Sillimanite and Beryllonite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Beryllonite- NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Sillimanite and Beryllonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Beryllonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Beryllonite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.79-2.87 whereas that of Beryllonite is 2.79-2.87.