Nepheline and Rock Crystal Physical Properties

Nepheline

Rock Crystal

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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

2.55-2.652.65

1 7.18

1.5 Fracture

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

ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

[1010] Poor

Not Available

1.7 Mohs Hardness

5-67

2 10

1.8 Chemical Composition

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

SiO 2Walter Schumann , Gemstones of the world (2001)

Nepheline and Rock Crystal Chemical Formula

While comparing Nepheline and Rock Crystal 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 Nepheline and Rock Crystal chemical formula.

Chemical formula of Nepheline- Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
Chemical formula of Rock Crystal- SiO 2Walter Schumann , Gemstones of the world (2001)

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Nepheline and Rock Crystal Specific Gravity

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