Sillimanite and Andradite Garnet Physical Properties

Sillimanite

Andradite Garnet

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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

3.20-3.263.8-3.9

1 7.18

1.5 Fracture

Splintery

Not Available

1.6 Cleavage

{010} perfect

None

1.7 Mohs Hardness

6-7.56.5-7.5

2 10

1.8 Chemical Composition

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

Ca₃Fe³⁺₂Si₃O₁₂

Sillimanite and Andradite Garnet Chemical Formula

While comparing Sillimanite and Andradite Garnet 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 Andradite Garnet chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Andradite Garnet- Ca₃Fe³⁺₂Si₃O₁₂

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Sillimanite and Andradite Garnet Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Andradite Garnet Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Andradite Garnet Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.8-3.9 whereas that of Andradite Garnet is 3.8-3.9.