Sillimanite and Arfvedsonite Physical Properties

Sillimanite

Arfvedsonite

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.263.3-3.5

1 7.18

1.5 Fracture

Splintery

Uneven, Brittle, Metallic, Brittle, Metallic

1.6 Cleavage

{010} perfect

Perfect on [110]

1.7 Mohs Hardness

6-7.55-6

2 10

1.8 Chemical Composition

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

NaNa2(Fe++4Fe+++)Si8O22(OH)2

Sillimanite and Arfvedsonite Chemical Formula

While comparing Sillimanite and Arfvedsonite 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 Arfvedsonite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Arfvedsonite- NaNa2(Fe++4Fe+++)Si8O22(OH)2

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Sillimanite and Arfvedsonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Arfvedsonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Arfvedsonite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.3-3.5 whereas that of Arfvedsonite is 3.3-3.5.