Kyanite and Andalusite Physical Properties

Kyanite

Andalusite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.53-3.65

3.05-3.21

1.5 Fracture

Splintery, Brittle, Metallic

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

1.6 Cleavage

[100] perfect [010] imperfect with 79° angle between

Good on {110}, poor on {100}

1.7 Mohs Hardness

4-7

7.5

1.8 Chemical Composition

Not Available

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

Kyanite and Andalusite Chemical Formula

While comparing Kyanite 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 Kyanite and Andalusite chemical formula.

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

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Kyanite and Andalusite Specific Gravity

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