Thulite and Alexandrite Physical Properties

Thulite

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

3.13.69-3.81

1 7.18

1.5 Fracture

Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)

Not Available

1.6 Cleavage

Perfect {010} imperfect {100}

1,1 ; 3,2.

1.7 Mohs Hardness

6-78.5

2 10

1.8 Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

BeAl ₂ O ₄

Thulite and Alexandrite Chemical Formula

While comparing Thulite 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 Thulite and Alexandrite chemical formula.

Chemical formula of Thulite- Ca₂Al₃(SiO₄)₃(OH)
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Thulite and Alexandrite Specific Gravity

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