Amethyst and Alexandrite Physical Properties

Amethyst

Alexandrite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

insoluble in common solvents

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.653.69-3.81

1 7.18

1.5 Fracture

Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)

Not Available

1.6 Cleavage

Indiscernible

1,1 ; 3,2.

1.7 Mohs Hardness

78.5

2 10

1.8 Chemical Composition

SiO₂

BeAl ₂ O ₄

Amethyst and Alexandrite Chemical Formula

While comparing Amethyst 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 Amethyst and Alexandrite chemical formula.

Chemical formula of Amethyst- SiO₂
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Amethyst and Alexandrite Specific Gravity

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