Alexandrite and Andradite Garnet Physical Properties

Alexandrite

Andradite Garnet

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.69-3.81

3.8-3.9

1.5 Fracture

Not Available

1.6 Cleavage

1,1 ; 3,2.

None

1.7 Mohs Hardness

8.5

6.5-7.5

1.8 Chemical Composition

BeAl ₂ O ₄

Ca₃Fe³⁺₂Si₃O₁₂

Alexandrite and Andradite Garnet Chemical Formula

While comparing Alexandrite and Andradite Garnet 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 Andradite Garnet chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Andradite Garnet- Ca₃Fe³⁺₂Si₃O₁₂

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Alexandrite and Andradite Garnet Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Andradite Garnet Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Andradite Garnet Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 3.8-3.9 whereas that of Andradite Garnet is 3.8-3.9.