Tanzanite and Sillimanite Physical Properties

Tanzanite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Hard

Not Available

1.4 Specific Gravity

3.353.20-3.26

1 7.18

1.5 Fracture

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

Splintery

1.6 Cleavage

Perfect {010}, imperfect {100}

{010} perfect

1.7 Mohs Hardness

6.5-76-7.5

2 10

1.8 Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

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

Tanzanite and Sillimanite Chemical Formula

While comparing Tanzanite 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 Tanzanite and Sillimanite chemical formula.

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

Compare Semi Precious Gemstones

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Tanzanite and Sillimanite Specific Gravity

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