Andalusite and Sillimanite Physical Properties

Andalusite

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

3.05-3.21

3.20-3.26

1.5 Fracture

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

Splintery

1.6 Cleavage

Good on {110}, poor on {100}

{010} perfect

1.7 Mohs Hardness

7.5

6-7.5

1.8 Chemical Composition

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

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

Andalusite and Sillimanite Chemical Formula

While comparing Andalusite 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 Andalusite and Sillimanite chemical formula.

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

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Andalusite and Sillimanite Specific Gravity

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