Achroite and Sillimanite Physical Properties

Achroite

Sillimanite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

2.90-3.40

Uneven, ConchoidalWalter Schumann

Indiscernible

7-7.5

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

Tough

3.20-3.26

Splintery

{010} perfect

6-7.5

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

Achroite and Sillimanite Chemical Formula

While comparing Achroite 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 Achroite and Sillimanite chemical formula.

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Achroite and Sillimanite Specific Gravity

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