Nepheline and Sillimanite Physical Properties

Nepheline

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.653.20-3.26

1 7.18

1.5 Fracture

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

Splintery

1.6 Cleavage

[1010] Poor

{010} perfect

1.7 Mohs Hardness

5-66-7.5

2 10

1.8 Chemical Composition

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

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Nepheline and Sillimanite Chemical Formula

While comparing Nepheline and Sillimanite 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 Sillimanite chemical formula.

Chemical formula of Nepheline- Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Nepheline and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Nepheline and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Nepheline and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Nepheline is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.