Alexandrite and Turquoise Physical Properties

Alexandrite

Turquoise

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.69-3.81

2.30-2.90

1.5 Fracture

Not Available

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

1,1 ; 3,2.

Good to perfect_usually N/A

1.7 Mohs Hardness

8.5

5-6

1.8 Chemical Composition

BeAl ₂ O ₄

CuAl₆(PO₄)₄(OH)₈ • 4H₂O

Alexandrite and Turquoise Chemical Formula

While comparing Alexandrite 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 Alexandrite and Turquoise chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Turquoise- CuAl₆(PO₄)₄(OH)₈ • 4H₂O

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Alexandrite and Turquoise Specific Gravity

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