Nepheline and Astrophyllite Physical Properties

Nepheline

Astrophyllite

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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

2.55-2.653.2-3.4

1 7.18

1.5 Fracture

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

Uneven, Brittle, Metallic

1.6 Cleavage

[1010] Poor

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

5-63

2 10

1.8 Chemical Composition

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

(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

Nepheline and Astrophyllite Chemical Formula

While comparing Nepheline and Astrophyllite 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 Astrophyllite chemical formula.

Chemical formula of Nepheline- Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

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Nepheline and Astrophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Nepheline and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Nepheline and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Nepheline is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.