Alexandrite and Chalcedony Physical Properties

Alexandrite

Chalcedony

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.69-3.81

2.55-2.70

1.5 Fracture

Not Available

Uneven, Splintery, Conchoidal, Uneven, Splintery, Conchoidal, UnevenWalter Schumann

1.6 Cleavage

1,1 ; 3,2.

Absent

1.7 Mohs Hardness

8.5

6.5-7

1.8 Chemical Composition

BeAl ₂ O ₄

SiO₂

Alexandrite and Chalcedony Chemical Formula

While comparing Alexandrite and Chalcedony 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 Chalcedony chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Chalcedony- SiO₂

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Alexandrite and Chalcedony Specific Gravity

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