Onyx and Neptunite Physical Properties

Onyx

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

2.55-2.703.19-3.23

1 7.18

1.5 Fracture

Not Available

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

1.6 Cleavage

Indiscernible

{110} good

1.7 Mohs Hardness

6.5-75-6

2 10

1.8 Chemical Composition

SiO₂

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

Onyx and Neptunite Chemical Formula

While comparing Onyx 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 Onyx and Neptunite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Neptunite- KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael OâDonoghue , Gems, Sixth Edition (2006)

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Onyx and Neptunite Specific Gravity

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