Petalite and Chalcedony Physical Properties

Petalite

Chalcedony

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

insoluble

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.40

2.55-2.70

1.5 Fracture

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

Uneven, Splintery, Conchoidal, Uneven, Splintery, Conchoidal, UnevenWalter Schumann

1.6 Cleavage

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

Absent

1.7 Mohs Hardness

6-6.5

6.5-7

1.8 Chemical Composition

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

SiO₂

Petalite and Chalcedony Chemical Formula

While comparing Petalite and Chalcedony 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 Petalite and Chalcedony chemical formula.

Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Chalcedony- SiO₂

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Petalite and Chalcedony Specific Gravity

Another important criteria for qualitative analysis of gemstones is Petalite and Chalcedony Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Petalite and Chalcedony Optical Properties during the identification of gemstone. Specific gravity of Petalite is 2.55-2.70 whereas that of Chalcedony is 2.55-2.70.