Topaz and Ruby Physical Properties

Topaz

Ruby

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.49-3.573.97-4.05

1 7.18

1.5 Fracture

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

Conchoidal

1.6 Cleavage

[001] Perfect

No true cleavage

1.7 Mohs Hardness

2 10

1.8 Chemical Composition

Al₂SiO₄(F,OH)₂

Al ₂ O ₃

Topaz and Ruby Chemical Formula

While comparing Topaz and Ruby 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 Topaz and Ruby chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂
Chemical formula of Ruby- Al ₂ O ₃

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Topaz and Ruby Specific Gravity

Another important criteria for qualitative analysis of gemstones is Topaz and Ruby Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Ruby Optical Properties during the identification of gemstone. Specific gravity of Topaz is 3.97-4.05 whereas that of Ruby is 3.97-4.05.