Andalusite and Turquoise Physical Properties

Andalusite

Turquoise

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Physical Properties

Tenacity

Solubility

Soluble

Durability

Specific Gravity

3.05-3.212.30-2.90

1 7.18

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Fracture

Uneven, Subconchoidal, Splintery

Conchoidal

Cleavage

Good on {110}, poor on {100}

Good to perfect_usually N/A

Mohs Hardness

7.55-6

2 10

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Chemical Composition

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

CuAl₆(PO₄)₄(OH)₈ • 4H₂O

Andalusite and Turquoise Chemical Formula

While comparing Andalusite and Turquoise 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 Andalusite and Turquoise chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Turquoise- CuAl₆(PO₄)₄(OH)₈ • 4H₂O

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Andalusite and Turquoise Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Turquoise Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Turquoise Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 2.30-2.90 whereas that of Turquoise is 2.30-2.90.