Dumortierite and Sillimanite Physical Properties

Dumortierite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.26-3.413.20-3.26

1 7.18

1.5 Fracture

Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references

Splintery

1.6 Cleavage

Distinct on {100}, poor on {110}; parting on {001}

{010} perfect

1.7 Mohs Hardness

7-8.56-7.5

2 10

1.8 Chemical Composition

AlAl₆O₃BSi₃O₁₈

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

Dumortierite and Sillimanite Chemical Formula

While comparing Dumortierite and Sillimanite 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 Dumortierite and Sillimanite chemical formula.

Chemical formula of Dumortierite- AlAl₆O₃BSi₃O₁₈
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Dumortierite and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Dumortierite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dumortierite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Dumortierite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.