Alunite and Turquoise Physical Properties

Alunite

Turquoise

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.92.30-2.90

1 7.18

1.5 Fracture

Conchoidal, Uneven

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

On {0001}, perfect

Good to perfect_usually N/A

1.7 Mohs Hardness

3.5-45-6

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

CuAl₆(PO₄)₄(OH)₈ • 4H₂O

Alunite and Turquoise Chemical Formula

While comparing Alunite 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 Alunite and Turquoise chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Turquoise- CuAl₆(PO₄)₄(OH)₈ • 4H₂O

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Alunite and Turquoise Specific Gravity

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