Topaz and Spinel Physical Properties

Topaz

Spinel

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

none

1.3 Durability

Not Available

1.4 Specific Gravity

3.49-3.57

3.64-3.66

1.5 Fracture

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

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

[001] Perfect

None, but may exhibit slight parting

1.7 Mohs Hardness

1.8 Chemical Composition

Al₂SiO₄(F,OH)₂

MgAl₂O₄

Topaz and Spinel Chemical Formula

While comparing Topaz 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 Topaz and Spinel chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂
Chemical formula of Spinel- MgAl₂O₄

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Topaz and Spinel Specific Gravity

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