Alexandrite and Emerald Physical Properties

Alexandrite

Emerald

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

Hard

1.4 Specific Gravity

3.69-3.812.67-2.78

1 7.18

1.5 Fracture

Not Available

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

1,1 ; 3,2.

Imperfect on the [0001]

1.7 Mohs Hardness

8.57.5-8

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

Be₃Al₂SiO₆

Alexandrite and Emerald Chemical Formula

While comparing Alexandrite and Emerald 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 Emerald chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Emerald- Be₃Al₂SiO₆

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Alexandrite and Emerald Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Emerald Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Emerald Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 2.67-2.78 whereas that of Emerald is 2.67-2.78.