Onyx and Nepheline Physical Properties

Onyx

Nepheline

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.702.55-2.65

1 7.18

1.5 Fracture

Not Available

Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

1.6 Cleavage

Indiscernible

[1010] Poor

1.7 Mohs Hardness

6.5-75-6

2 10

1.8 Chemical Composition

SiO₂

Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.

Onyx and Nepheline Chemical Formula

While comparing Onyx and Nepheline 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 Nepheline chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Nepheline- Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.

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Onyx and Nepheline Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Nepheline Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Nepheline Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.55-2.65 whereas that of Nepheline is 2.55-2.65.