Andalusite and Dumortierite Physical Properties

Andalusite

Dumortierite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.05-3.213.26-3.41

1 7.18

1.5 Fracture

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

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

1.6 Cleavage

Good on {110}, poor on {100}

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

1.7 Mohs Hardness

7.57-8.5

2 10

1.8 Chemical Composition

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

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.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Dumortierite- AlAl₆O₃BSi₃O₁₈

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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 and Dumortierite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 3.26-3.41 whereas that of Dumortierite is 3.26-3.41.