Corundum and Sugilite Physical Properties

Corundum

Sugilite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.90-4.052.69-2.79

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Difficult, Fibrous

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

None – parting in 3 directions

Poor on {0001}

1.7 Mohs Hardness

95.5-6.5

2 10

1.8 Chemical Composition

Al 2O 3Arthur Thomas , Gemstones (2009)

KNa 2(Fe3+ ,Mn3+ ,Al) 2Li 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Corundum and Sugilite Chemical Formula

While comparing Corundum and Sugilite 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 Corundum and Sugilite chemical formula.

Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Sugilite- KNa 2(Fe3+ ,Mn3+ ,Al) 2Li 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Corundum and Sugilite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Corundum and Sugilite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Sugilite Optical Properties during the identification of gemstone. Specific gravity of Corundum is 2.69-2.79 whereas that of Sugilite is 2.69-2.79.