Vivianite and Gibbsite Physical Properties

Vivianite

Gibbsite

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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

2.64-2.702.35

1 7.18

1.5 Fracture

(e.g. graphite).

Fibrous, Difficult, Fibrous

1.6 Cleavage

{010} Perfect

{001} Perfect

1.7 Mohs Hardness

Not Available2.5-3

2 10

1.8 Chemical Composition

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

Al(OH)3

Vivianite and Gibbsite Chemical Formula

While comparing Vivianite and Gibbsite 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 Gibbsite chemical formula.

Chemical formula of Vivianite- Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.
Chemical formula of Gibbsite- Al(OH)3

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Vivianite and Gibbsite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Vivianite and Gibbsite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Vivianite and Gibbsite Optical Properties during the identification of gemstone. Specific gravity of Vivianite is 2.35 whereas that of Gibbsite is 2.35.