Epidote and Alexandrite Physical Properties

Epidote

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

3.25-3.50

3.69-3.81

1.5 Fracture

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Fibrous

Not Available

1.6 Cleavage

{001} perfect and {100} imperfect

1,1 ; 3,2.

1.7 Mohs Hardness

6-7

8.5

1.8 Chemical Composition

CaAl 2(Fe3+ ,Al)Si 3O 12(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

BeAl ₂ O ₄

Epidote and Alexandrite Chemical Formula

While comparing Epidote 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 Epidote and Alexandrite chemical formula.

Chemical formula of Epidote- CaAl 2(Fe3+ ,Al)Si 3O 12(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Epidote and Alexandrite Specific Gravity

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