Vivianite and Andalusite Physical Properties

Vivianite

Andalusite

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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

2.64-2.70

3.05-3.21

1.5 Fracture

(e.g. graphite).

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

1.6 Cleavage

{010} Perfect

Good on {110}, poor on {100}

1.7 Mohs Hardness

Not Available

7.5

1.8 Chemical Composition

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

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

Vivianite and Andalusite Chemical Formula

While comparing Vivianite 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 Vivianite and Andalusite chemical formula.

Chemical formula of Vivianite- Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Vivianite and Andalusite Specific Gravity

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