Kyanite and Sillimanite Physical Properties

Kyanite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.53-3.653.20-3.26

1 7.18

1.8 Fracture

Splintery, Brittle, Metallic

Splintery

1.9 Cleavage

[100] perfect [010] imperfect with 79° angle between

{010} perfect

1.10 Mohs Hardness

4-76-7.5

2 10

1.12 Chemical Composition

Not Available

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

Kyanite and Sillimanite Chemical Formula

While comparing Kyanite 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 Kyanite and Sillimanite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Kyanite Vs Blue quartz

Kyanite Vs Swiss blue topaz

Kyanite and Sillimanite Specific Gravity

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