Sillimanite and Albite Physical Properties

Sillimanite

Albite

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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

3.20-3.262.60-2.65

1 7.18

1.5 Fracture

Splintery

Uneven, Uneven, Gems, Sixth Edition (2006), Uneven, Conchoidal

1.6 Cleavage

{010} perfect

Perfect on {001}, very good on {010}, imperfect on {110}

1.7 Mohs Hardness

6-7.56-6.5

2 10

1.8 Chemical Composition

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

NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

Sillimanite and Albite Chemical Formula

While comparing Sillimanite and Albite 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 Albite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Albite- NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

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Sillimanite and Albite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Albite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Albite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.60-2.65 whereas that of Albite is 2.60-2.65.