Alexandrite and Sardonyx Physical Properties

Alexandrite

Sardonyx

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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

3.69-3.812.55-2.70

1 7.18

1.5 Fracture

Not Available

1.6 Cleavage

1,1 ; 3,2.

Not Available

1.7 Mohs Hardness

8.56.5-7

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

SiO 2Ulrich Henn and Claudio C.

Alexandrite and Sardonyx Chemical Formula

While comparing Alexandrite and Sardonyx 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 Sardonyx chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Sardonyx- SiO 2Ulrich Henn and Claudio C.

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Alexandrite and Sardonyx Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Sardonyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Sardonyx Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 2.55-2.70 whereas that of Sardonyx is 2.55-2.70.