Alexandrite and Riebeckite Physical Properties

Alexandrite

Riebeckite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.69-3.81

3.28-3.44

1.5 Fracture

Not Available

Uneven, Splintery, Brittle

1.6 Cleavage

1,1 ; 3,2.

Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}

1.7 Mohs Hardness

8.5

5.0-6.0

1.8 Chemical Composition

BeAl ₂ O ₄

Not Available

Alexandrite and Riebeckite Chemical Formula

While comparing Alexandrite and Riebeckite 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 Riebeckite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄

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Alexandrite and Riebeckite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Riebeckite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Riebeckite Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 3.28-3.44 whereas that of Riebeckite is 3.28-3.44.