Sillimanite and Nepheline Physical Properties

Sillimanite

Nepheline

Add ⊕

1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.262.55-2.65

1 7.18

1.5 Fracture

Splintery

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

1.6 Cleavage

{010} perfect

[1010] Poor

1.7 Mohs Hardness

6-7.55-6

2 10

1.8 Chemical Composition

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

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

Sillimanite and Nepheline Chemical Formula

While comparing Sillimanite 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 Sillimanite and Nepheline chemical formula.

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

Compare Blue Gemstones

Sillimanite Vs Strontium Titanate

Sillimanite Vs Tanzanite

Sillimanite Vs Starlite

Sillimanite and Nepheline Specific Gravity

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