Andalusite and Dumortierite Physical Properties

Andalusite

Dumortierite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

3.05-3.21

Uneven, Subconchoidal, Splintery

Good on {110}, poor on {100}

7.5

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

3.26-3.41

Fibrous, ConchoidalWalter Schumann

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

7-8.5

AlAl₆O₃BSi₃O₁₈

Andalusite and Dumortierite Chemical Formula

While comparing Andalusite 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 Andalusite and Dumortierite chemical formula.

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Andalusite and Dumortierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Dumortierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite Vs Dumortierite during the identification of gemstone. Specific gravity of Andalusite is whereas that of Dumortierite is .