Alexandrite and Alunite Physical Properties

Alexandrite

Alunite

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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

2.6-2.9

1.5 Fracture

Not Available

Conchoidal, Uneven

1.6 Cleavage

1,1 ; 3,2.

On {0001}, perfect

1.7 Mohs Hardness

8.5

3.5-4

1.8 Chemical Composition

BeAl ₂ O ₄

KAl3(SO4)2(OH)6

Alexandrite and Alunite Chemical Formula

While comparing Alexandrite and Alunite 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 Alunite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Alunite- KAl3(SO4)2(OH)6

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Alexandrite and Alunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Alunite Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 2.6-2.9 whereas that of Alunite is 2.6-2.9.