Sillimanite and Dumortierite Physical Properties

Sillimanite

Dumortierite

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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

3.20-3.263.26-3.41

1 7.18

1.5 Fracture

Splintery

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

1.6 Cleavage

{010} perfect

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

1.7 Mohs Hardness

6-7.57-8.5

2 10

1.8 Chemical Composition

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

AlAl₆O₃BSi₃O₁₈

Sillimanite and Dumortierite Chemical Formula

While comparing Sillimanite and Dumortierite 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 Dumortierite chemical formula.

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

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Sillimanite and Dumortierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Dumortierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Dumortierite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.26-3.41 whereas that of Dumortierite is 3.26-3.41.