Peridot and Neptunite Physical Properties

Peridot

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

1.54-1.553.19-3.23

1 7.18

1.5 Fracture

Conchoidal

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

1.6 Cleavage

Poor

{110} good

1.7 Mohs Hardness

6.5-75-6

2 10

1.8 Chemical Composition

(Mg,Fe)₂SiO₄

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

Peridot and Neptunite Chemical Formula

While comparing Peridot 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 Peridot and Neptunite chemical formula.

Chemical formula of Peridot- (Mg,Fe)₂SiO₄
Chemical formula of Neptunite- KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael OâDonoghue , Gems, Sixth Edition (2006)

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Peridot and Neptunite Specific Gravity

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