Alexandrite and Mottramite Physical Properties

Alexandrite

Mottramite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.69-3.81

5.9

1.5 Fracture

Not Available

Sub-Conchoidal, Brittle, Metallic

1.6 Cleavage

1,1 ; 3,2.

None observed

1.7 Mohs Hardness

8.5

1.8 Chemical Composition

BeAl ₂ O ₄

Not Available

Alexandrite and Mottramite Chemical Formula

While comparing Alexandrite and Mottramite 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 Mottramite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄

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Alexandrite and Mottramite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Mottramite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Mottramite Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 5.9 whereas that of Mottramite is 5.9.