Lazurite and Neptunite Physical Properties

Lazurite

Neptunite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.753.19-3.23

1 7.18

1.5 Fracture

Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle

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

1.6 Cleavage

Imperfect on {110}

{110} good

1.7 Mohs Hardness

5.55-6

2 10

1.8 Chemical Composition

(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

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

Lazurite and Neptunite Chemical Formula

While comparing Lazurite 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 Lazurite and Neptunite chemical formula.

Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Chemical formula of Neptunite- KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael OâDonoghue , Gems, Sixth Edition (2006)

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Lazurite and Neptunite Specific Gravity

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