Opal and Vivianite Physical Properties

Opal

Vivianite

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1 Physical Properties

1.1 Tenacity

BrittleWalter Schumann

Not Available

1.2 Solubility

hot salt water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.98-2.252.64-2.70

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle

(e.g. graphite).

1.6 Cleavage

None

{010} Perfect

1.7 Mohs Hardness

5-6.5Not Available

2 10

1.8 Chemical Composition

SiO₂ · nH₂O

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

Opal and Vivianite Chemical Formula

While comparing Opal 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 Opal and Vivianite chemical formula.

Chemical formula of Opal- SiO₂ · nH₂O
Chemical formula of Vivianite- Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.

Compare Semi Precious Gemstones

Opal Vs Lehsunia

Opal Vs Alexandrite

Opal Vs Amethyst

Opal and Vivianite Specific Gravity

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