Ruby and Alexandrite Physical Properties

Ruby

Alexandrite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.97-4.053.69-3.81

1 7.18

1.5 Fracture

Conchoidal

Not Available

1.6 Cleavage

No true cleavage

1,1 ; 3,2.

1.7 Mohs Hardness

98.5

2 10

1.8 Chemical Composition

Al ₂ O ₃

BeAl ₂ O ₄

Ruby and Alexandrite Chemical Formula

While comparing Ruby and Alexandrite 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 Ruby and Alexandrite chemical formula.

Chemical formula of Ruby- Al ₂ O ₃
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Ruby and Alexandrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ruby and Alexandrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ruby and Alexandrite Optical Properties during the identification of gemstone. Specific gravity of Ruby is 3.69-3.81 whereas that of Alexandrite is 3.69-3.81.