Sillimanite and Carnelian Physical Properties

Sillimanite

Carnelian

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.262.58-2.64

1 7.18

1.5 Fracture

Splintery

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

1.6 Cleavage

{010} perfect

Absent

1.7 Mohs Hardness

6-7.56.5-7

2 10

1.8 Chemical Composition

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

SiO₂

Sillimanite and Carnelian Chemical Formula

While comparing Sillimanite and Carnelian 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 Carnelian chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Carnelian- SiO₂

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Sillimanite and Carnelian Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Carnelian Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Carnelian Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.58-2.64 whereas that of Carnelian is 2.58-2.64.