Sard and Alexandrite Physical Properties

Sard

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

2.58-2.633.69-3.81

1 7.18

1.5 Fracture

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

Not Available

1.6 Cleavage

Not Available

1,1 ; 3,2.

1.7 Mohs Hardness

6.5-78.5

2 10

1.8 Chemical Composition

SiO 2Ulrich Henn and Claudio C.

BeAl ₂ O ₄

Sard and Alexandrite Chemical Formula

While comparing Sard 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 Sard and Alexandrite chemical formula.

Chemical formula of Sard- SiO 2Ulrich Henn and Claudio C.
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Sard Vs Sillimanite

Sard Vs Sodalite

Sard Vs Spinel

Sard and Alexandrite Specific Gravity

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