Alexandrite and Umbalite Physical Properties

Alexandrite

Umbalite

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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

3.69-3.813.62-4.33

1 7.18

1.5 Fracture

Not Available

Uneven, Uneven, ConchoidalGemdat.org, Management Team (2012)

1.6 Cleavage

1,1 ; 3,2.

Not Available

1.7 Mohs Hardness

8.57-7.5

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)

Alexandrite and Umbalite Chemical Formula

While comparing Alexandrite and Umbalite 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 Umbalite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Umbalite- Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)

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Alexandrite and Umbalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Umbalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Umbalite Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 3.62-4.33 whereas that of Umbalite is 3.62-4.33.