Ruby and Spinel Physical Properties

Ruby

Spinel

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

none

1.3 Durability

Not Available

1.4 Specific Gravity

3.97-4.053.64-3.66

1 7.18

1.5 Fracture

Conchoidal

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

No true cleavage

None, but may exhibit slight parting

1.7 Mohs Hardness

2 10

1.8 Chemical Composition

Al ₂ O ₃

MgAl₂O₄

Ruby and Spinel Chemical Formula

While comparing Ruby and Spinel 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 Spinel chemical formula.

Chemical formula of Ruby- Al ₂ O ₃
Chemical formula of Spinel- MgAl₂O₄

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Ruby and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ruby and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ruby and Spinel Optical Properties during the identification of gemstone. Specific gravity of Ruby is 3.64-3.66 whereas that of Spinel is 3.64-3.66.