Sillimanite and Andradite Physical Properties

Sillimanite

Andradite

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.263.70-4.10

1 7.18

1.5 Fracture

Splintery

Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

{010} perfect

none

1.7 Mohs Hardness

6-7.56.5-7

2 10

1.8 Chemical Composition

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

Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Sillimanite and Andradite Chemical Formula

While comparing Sillimanite and Andradite 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 chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Andradite- Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

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Sillimanite and Andradite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Andradite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Andradite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.70-4.10 whereas that of Andradite is 3.70-4.10.