Corundum and Kornerupine Physical Properties

Corundum

Kornerupine

Add ⊕

1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.90-4.053.25-3.45

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Difficult, Fibrous

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

1.6 Cleavage

None – parting in 3 directions

Good on {110}

1.7 Mohs Hardness

96.5

2 10

1.8 Chemical Composition

Al 2O 3Arthur Thomas , Gemstones (2009)

Mg 3Al 6(Si,Al,B) 5O 21(OH)Walter Schumann , Gemstones of the world (2001) More from other references

Corundum and Kornerupine Chemical Formula

While comparing Corundum and Kornerupine 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 Kornerupine chemical formula.

Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Kornerupine- Mg 3Al 6(Si,Al,B) 5O 21(OH)Walter Schumann , Gemstones of the world (2001) More from other references

Compare Violet Gemstones

Corundum Vs Hackmanite

Corundum Vs Hexagonite

Corundum Vs Garnet

Corundum and Kornerupine Specific Gravity

Another important criteria for qualitative analysis of gemstones is Corundum and Kornerupine Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Kornerupine Optical Properties during the identification of gemstone. Specific gravity of Corundum is 3.25-3.45 whereas that of Kornerupine is 3.25-3.45.