Sillimanite and Vivianite Physical Properties

Sillimanite

Vivianite

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.262.64-2.70

1 7.18

1.5 Fracture

Splintery

(e.g. graphite).

1.6 Cleavage

{010} perfect

{010} Perfect

1.7 Mohs Hardness

6-7.5Not Available

2 10

1.8 Chemical Composition

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

Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.

Sillimanite and Vivianite Chemical Formula

While comparing Sillimanite and Vivianite 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 Vivianite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Vivianite- Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.

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Sillimanite and Vivianite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Vivianite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Vivianite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.64-2.70 whereas that of Vivianite is 2.64-2.70.