Nepheline and Apophyllite Physical Properties

Nepheline

Apophyllite

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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

2.55-2.65

2.30-2.50

1.5 Fracture

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

Uneven, UnevenArthur Thomas, Gemstones (2009)

1.6 Cleavage

[1010] Poor

Perfect on (001)

1.7 Mohs Hardness

5-6

4.5-5

1.8 Chemical Composition

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

KCa 4Si 8O 20(F,OH) · 8H 2OUlrich Henn and Claudio C.

Nepheline and Apophyllite Chemical Formula

While comparing Nepheline and Apophyllite 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 Apophyllite chemical formula.

Chemical formula of Nepheline- Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
Chemical formula of Apophyllite- KCa 4Si 8O 20(F,OH) · 8H 2OUlrich Henn and Claudio C.

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Nepheline and Apophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Nepheline and Apophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Nepheline and Apophyllite Optical Properties during the identification of gemstone. Specific gravity of Nepheline is 2.30-2.50 whereas that of Apophyllite is 2.30-2.50.