Phlogopite and Alexandrite Physical Properties

Phlogopite

Alexandrite

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.78-2.85

3.69-3.81

1.5 Fracture

None, Uneven

Not Available

1.6 Cleavage

Perfect basal (001)

1,1 ; 3,2.

1.7 Mohs Hardness

2-2.5

8.5

1.8 Chemical Composition

Not Available

BeAl ₂ O ₄

Phlogopite and Alexandrite Chemical Formula

While comparing Phlogopite 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 Phlogopite and Alexandrite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄

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Phlogopite and Alexandrite Specific Gravity

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