Datolite and Alexandrite Physical Properties

Datolite

Alexandrite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.90-3.00

3.69-3.81

1.5 Fracture

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Metallic

Not Available

1.6 Cleavage

None

1,1 ; 3,2.

1.7 Mohs Hardness

5-5.5

8.5

1.8 Chemical Composition

CaBSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

BeAl ₂ O ₄

Datolite and Alexandrite Chemical Formula

While comparing Datolite 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 Datolite and Alexandrite chemical formula.

Chemical formula of Datolite- CaBSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Datolite and Alexandrite Specific Gravity

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