Arfvedsonite and Andalusite Physical Properties

Arfvedsonite

Andalusite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.3-3.53.05-3.21

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic, Brittle, Metallic

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

1.6 Cleavage

Perfect on [110]

Good on {110}, poor on {100}

1.7 Mohs Hardness

5-67.5

2 10

1.8 Chemical Composition

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

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Arfvedsonite and Andalusite Chemical Formula

While comparing Arfvedsonite and Andalusite 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 Arfvedsonite and Andalusite chemical formula.

Chemical formula of Arfvedsonite- NaNa2(Fe++4Fe+++)Si8O22(OH)2
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Arfvedsonite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Arfvedsonite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Arfvedsonite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Arfvedsonite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.