Onyx and Vivianite Physical Properties

Onyx

Vivianite

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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

2.55-2.702.64-2.70

1 7.18

1.5 Fracture

Not Available

(e.g. graphite).

1.6 Cleavage

Indiscernible

{010} Perfect

1.7 Mohs Hardness

6.5-7Not Available

2 10

1.8 Chemical Composition

SiO₂

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

Onyx and Vivianite Chemical Formula

While comparing Onyx 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 Onyx and Vivianite chemical formula.

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

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Onyx and Vivianite Specific Gravity

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