Iolite and Spinel Physical Properties

Iolite

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

2.6-2.73.64-3.66

1 7.18

1.5 Fracture

Not Available

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

3,1

None, but may exhibit slight parting

1.7 Mohs Hardness

7-7.58

2 10

1.8 Chemical Composition

Mg₂Al₄Si₅O₁₈

MgAl₂O₄

Iolite and Spinel Chemical Formula

While comparing Iolite 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 Iolite and Spinel chemical formula.

Chemical formula of Iolite- Mg₂Al₄Si₅O₁₈
Chemical formula of Spinel- MgAl₂O₄

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Iolite and Spinel Specific Gravity

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