Sillimanite and Ajoite Physical Properties

Sillimanite

Ajoite

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

Decomposed by acids

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.262.96

1 7.18

1.5 Fracture

Splintery

Not Available

1.6 Cleavage

{010} perfect

Perfect on {010}

1.7 Mohs Hardness

6-7.55

2 10

1.8 Chemical Composition

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

(K,Na)3Cu20Al3Si29O76(OH)16•~8(H2O)

Sillimanite and Ajoite Chemical Formula

While comparing Sillimanite and Ajoite 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 Ajoite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Ajoite- (K,Na)3Cu20Al3Si29O76(OH)16•~8(H2O)

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Sillimanite and Ajoite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Ajoite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Ajoite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.96 whereas that of Ajoite is 2.96.