Alexandrite and Galena Physical Properties

Alexandrite

Galena

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.69-3.816.23

1 7.18

1.5 Fracture

Not Available

Subconchoidal, Brittle, Metallic

1.6 Cleavage

1,1 ; 3,2.

Cubic perfect on [001], parting on [111]

1.7 Mohs Hardness

8.52.5-2.75

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

PbS

Alexandrite and Galena Chemical Formula

While comparing Alexandrite and Galena 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 Galena chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Galena- PbS

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Alexandrite and Galena Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Galena Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Galena Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 6.23 whereas that of Galena is 6.23.