Kyanite and Petalite Physical Properties

Kyanite

Petalite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.53-3.652.40

1 7.18

1.5 Fracture

Splintery, Brittle, Metallic

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

1.6 Cleavage

[100] perfect [010] imperfect with 79° angle between

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

1.7 Mohs Hardness

4-76-6.5

2 10

1.8 Chemical Composition

Not Available

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

Kyanite and Petalite Chemical Formula

While comparing Kyanite 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 Kyanite and Petalite chemical formula.

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

Compare Blue Gemstones

Kyanite Vs Swiss blue topaz

Kyanite Vs Kashmir sapphire

Kyanite Vs Blue quartz

Kyanite and Petalite Specific Gravity

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