Chlorastrolite and Alexandrite Physical Properties

Chlorastrolite

Alexandrite

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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

3.1-3.5

3.69-3.81

1.5 Fracture

Granular

Not Available

1.6 Cleavage

Not Available

1,1 ; 3,2.

1.7 Mohs Hardness

5-6

8.5

1.8 Chemical Composition

Ca 2(Mg,Fe)Al 2(SiO 4)(Si 2O 7)(OH) 2 · H 2O)Arthur Thomas , Gemstones (2009)

BeAl ₂ O ₄

Chlorastrolite and Alexandrite Chemical Formula

While comparing Chlorastrolite 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 Chlorastrolite and Alexandrite chemical formula.

Chemical formula of Chlorastrolite- Ca 2(Mg,Fe)Al 2(SiO 4)(Si 2O 7)(OH) 2 · H 2O)Arthur Thomas , Gemstones (2009)
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Chlorastrolite and Alexandrite Specific Gravity

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