Allanite and Andalusite Physical Properties

Allanite

Andalusite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

3.40-4.20

Indistinct

-9999

Ca(Ce,La,Y,Ca)Al2(Fe,Al)Si3O12(OH)

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

Allanite and Andalusite Chemical Formula

While comparing Allanite 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 Allanite and Andalusite chemical formula.

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Allanite and Andalusite Specific Gravity

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