Alexandrite and Tourmaline Physical Properties

Alexandrite

Tourmaline

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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

3.69-3.812.85-3.35

1 7.18

1.5 Fracture

Not Available

Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

1,1 ; 3,2.

Indistinct

1.7 Mohs Hardness

8.57-7.5

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.

Alexandrite and Tourmaline Chemical Formula

While comparing Alexandrite and Tourmaline 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 Tourmaline chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Tourmaline- Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.

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Alexandrite and Tourmaline Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Tourmaline Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Tourmaline Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 2.85-3.35 whereas that of Tourmaline is 2.85-3.35.