Dumortierite and Petalite Physical Properties

Dumortierite

Petalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.26-3.412.40

1 7.18

1.5 Fracture

Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references

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

1.6 Cleavage

Distinct on {100}, poor on {110}; parting on {001}

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

1.7 Mohs Hardness

7-8.56-6.5

2 10

1.8 Chemical Composition

AlAl₆O₃BSi₃O₁₈

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

Dumortierite and Petalite Chemical Formula

While comparing Dumortierite 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 Dumortierite and Petalite chemical formula.

Chemical formula of Dumortierite- AlAl₆O₃BSi₃O₁₈
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Dumortierite and Petalite Specific Gravity

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