Sillimanite and Tanzanite Physical Properties

Sillimanite

Tanzanite

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

Hard

1.4 Specific Gravity

3.20-3.26

3.35

1.5 Fracture

Splintery

Uneven, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

{010} perfect

Perfect {010}, imperfect {100}

1.7 Mohs Hardness

6-7.5

6.5-7

1.8 Chemical Composition

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

Ca₂Al₃(SiO₄)₃(OH)

Sillimanite and Tanzanite Chemical Formula

While comparing Sillimanite and Tanzanite 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 Tanzanite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Tanzanite- Ca₂Al₃(SiO₄)₃(OH)

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Sillimanite and Tanzanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Tanzanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Tanzanite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.35 whereas that of Tanzanite is 3.35.