Turquoise and Alunite Physical Properties

Turquoise

Alunite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.30-2.902.6-2.9

1 7.18

1.5 Fracture

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle

Conchoidal, Uneven

1.6 Cleavage

Good to perfect_usually N/A

On {0001}, perfect

1.7 Mohs Hardness

5-63.5-4

2 10

1.8 Chemical Composition

CuAl₆(PO₄)₄(OH)₈ • 4H₂O

KAl3(SO4)2(OH)6

Turquoise and Alunite Chemical Formula

While comparing Turquoise and Alunite 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 Turquoise and Alunite chemical formula.

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

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Turquoise and Alunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Turquoise and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Turquoise and Alunite Optical Properties during the identification of gemstone. Specific gravity of Turquoise is 2.6-2.9 whereas that of Alunite is 2.6-2.9.