Sardonyx and Sillimanite Physical Properties

Sardonyx

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.70

3.20-3.26

1.5 Fracture

Not Available

Splintery

1.6 Cleavage

Not Available

{010} perfect

1.7 Mohs Hardness

6.5-7

6-7.5

1.8 Chemical Composition

SiO 2Ulrich Henn and Claudio C.

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

Sardonyx and Sillimanite Chemical Formula

While comparing Sardonyx 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 Sardonyx and Sillimanite chemical formula.

Chemical formula of Sardonyx- SiO 2Ulrich Henn and Claudio C.
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Sardonyx and Sillimanite Specific Gravity

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