Petalite and Star Sapphire Physical Properties

Petalite

Star Sapphire

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.403.90-4.05

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

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

Not Available

1.7 Mohs Hardness

6-6.5Not Available

2 10

1.8 Chemical Composition

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

Al 2O 3Ulrich Henn and Claudio C.

Petalite and Star Sapphire Chemical Formula

While comparing Petalite and Star Sapphire 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 Star Sapphire chemical formula.

Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Star Sapphire- Al 2O 3Ulrich Henn and Claudio C.

Compare Gems Found In Australia

Petalite Vs Scolecite

Petalite Vs Sapphire

Petalite Vs Scheelite

Petalite and Star Sapphire Specific Gravity

Another important criteria for qualitative analysis of gemstones is Petalite and Star Sapphire Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Petalite and Star Sapphire Optical Properties during the identification of gemstone. Specific gravity of Petalite is 3.90-4.05 whereas that of Star Sapphire is 3.90-4.05.