Sillimanite and Andalusite Physical Properties

Sillimanite

Andalusite

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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

3.20-3.26

3.05-3.21

1.5 Fracture

Splintery

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

1.6 Cleavage

{010} perfect

Good on {110}, poor on {100}

1.7 Mohs Hardness

6-7.5

7.5

1.8 Chemical Composition

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

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

Sillimanite and Andalusite Chemical Formula

While comparing Sillimanite and Andalusite 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 Andalusite chemical formula.

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

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Sillimanite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.