Alexandrite and Petalite Physical Properties

Alexandrite

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

3.69-3.812.40

1 7.18

1.5 Fracture

Not Available

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

1.6 Cleavage

1,1 ; 3,2.

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

1.7 Mohs Hardness

8.56-6.5

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

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

Alexandrite and Petalite Chemical Formula

While comparing Alexandrite 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 Alexandrite and Petalite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Compare Gems for Scorpio

Alexandrite Vs Fluorite

Alexandrite Vs Citrine

Alexandrite Vs Gahnospinel

Alexandrite and Petalite Specific Gravity

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