Riebeckite and Alexandrite Physical Properties

Riebeckite

Alexandrite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.28-3.44

3.69-3.81

1.5 Fracture

Uneven, Splintery, Brittle

Not Available

1.6 Cleavage

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

1,1 ; 3,2.

1.7 Mohs Hardness

5.0-6.0

8.5

1.8 Chemical Composition

Not Available

BeAl ₂ O ₄

Riebeckite and Alexandrite Chemical Formula

While comparing Riebeckite and Alexandrite 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 Riebeckite and Alexandrite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄

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Riebeckite and Alexandrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Riebeckite and Alexandrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Riebeckite and Alexandrite Optical Properties during the identification of gemstone. Specific gravity of Riebeckite is 3.69-3.81 whereas that of Alexandrite is 3.69-3.81.