Alexandrite and Pyrope Physical Properties

Alexandrite

Pyrope

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

insoluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

3.69-3.813.62-3.87

1 7.18

1.5 Fracture

Not Available

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

1,1 ; 3,2.

None

1.7 Mohs Hardness

8.57-7.5

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

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

Alexandrite and Pyrope Chemical Formula

While comparing Alexandrite and Pyrope 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 Alexandrite and Pyrope chemical formula.

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

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Alexandrite and Pyrope Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Pyrope Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Pyrope Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 3.62-3.87 whereas that of Pyrope is 3.62-3.87.