Pyrope and Alexandrite Physical Properties

Pyrope

Alexandrite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

insoluble in water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.62-3.87

3.69-3.81

1.5 Fracture

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle

Not Available

1.6 Cleavage

None

1,1 ; 3,2.

1.7 Mohs Hardness

7-7.5

8.5

1.8 Chemical Composition

Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

BeAl ₂ O ₄

Pyrope and Alexandrite Chemical Formula

While comparing Pyrope 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 Pyrope and Alexandrite chemical formula.

Chemical formula of Pyrope- Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Pyrope and Alexandrite Specific Gravity

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