Turquoise and Petalite Physical Properties

Turquoise

Petalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Soluble

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.30-2.902.40

1 7.18

1.5 Fracture

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle

Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal

1.6 Cleavage

Good to perfect_usually N/A

Perfect on {001}, poor on {201} with 38.5° angle between the two

1.7 Mohs Hardness

5-66-6.5

2 10

1.8 Chemical Composition

CuAl₆(PO₄)₄(OH)₈ • 4H₂O

LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Turquoise and Petalite Chemical Formula

While comparing Turquoise and Petalite 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 Petalite chemical formula.

Chemical formula of Turquoise- CuAl₆(PO₄)₄(OH)₈ • 4H₂O
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Turquoise and Petalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Turquoise and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Turquoise and Petalite Optical Properties during the identification of gemstone. Specific gravity of Turquoise is 2.40 whereas that of Petalite is 2.40.