Zinnwaldite and Alexandrite Physical Properties

Zinnwaldite

Alexandrite

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1 Physical Properties

1.1 Tenacity

Elastic

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.9-3.1

3.69-3.81

1.5 Fracture

Uneven

Not Available

1.6 Cleavage

Perfect basal {001}

1,1 ; 3,2.

1.7 Mohs Hardness

3.5-4.0

8.5

1.8 Chemical Composition

Not Available

BeAl ₂ O ₄

Zinnwaldite and Alexandrite Chemical Formula

While comparing Zinnwaldite 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 Zinnwaldite and Alexandrite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄

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Zinnwaldite and Alexandrite Specific Gravity

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