Alexandrite and Neptunite Physical Properties

Alexandrite

Neptunite

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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

3.69-3.813.19-3.23

1 7.18

1.5 Fracture

Not Available

Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle

1.6 Cleavage

1,1 ; 3,2.

{110} good

1.7 Mohs Hardness

8.55-6

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael OâDonoghue , Gems, Sixth Edition (2006)

Alexandrite and Neptunite Chemical Formula

While comparing Alexandrite and Neptunite 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 Neptunite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Neptunite- KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael OâDonoghue , Gems, Sixth Edition (2006)

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Alexandrite and Neptunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Neptunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Neptunite Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 3.19-3.23 whereas that of Neptunite is 3.19-3.23.