Iolite and Andalusite Physical Properties

Iolite

Andalusite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.73.05-3.21

1 7.18

1.5 Fracture

Not Available

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

1.6 Cleavage

3,1

Good on {110}, poor on {100}

1.7 Mohs Hardness

7-7.57.5

2 10

1.8 Chemical Composition

Mg₂Al₄Si₅O₁₈

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Iolite and Andalusite Chemical Formula

While comparing Iolite and Andalusite 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 Andalusite chemical formula.

Chemical formula of Iolite- Mg₂Al₄Si₅O₁₈
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Iolite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Iolite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Iolite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Iolite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.