Alexandrite and Corundum Physical Properties

Alexandrite

Corundum

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.69-3.813.90-4.05

1 7.18

1.5 Fracture

Not Available

Uneven, Uneven, Gems, Difficult, Fibrous

1.6 Cleavage

1,1 ; 3,2.

None – parting in 3 directions

1.7 Mohs Hardness

8.59

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

Al 2O 3Arthur Thomas , Gemstones (2009)

Alexandrite and Corundum Chemical Formula

While comparing Alexandrite and Corundum 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 Alexandrite and Corundum chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)

Compare Gems for Scorpio

Alexandrite Vs Fluorite

Alexandrite Vs Gahnospinel

Alexandrite Vs Citrine

Alexandrite and Corundum Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Corundum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Corundum Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 3.90-4.05 whereas that of Corundum is 3.90-4.05.