Sillimanite and Goshenite Physical Properties

Sillimanite

Goshenite

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.262.60-2.90

1 7.18

1.5 Fracture

Splintery

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

{010} perfect

3,1 basal

1.7 Mohs Hardness

6-7.57.5-8

2 10

1.8 Chemical Composition

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

Be₃Al₂SiO₆

Sillimanite and Goshenite Chemical Formula

While comparing Sillimanite and Goshenite 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 Goshenite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Goshenite- Be₃Al₂SiO₆

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Sillimanite and Goshenite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Goshenite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Goshenite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.60-2.90 whereas that of Goshenite is 2.60-2.90.