Marcasite and Onyx Physical Properties

Marcasite

Onyx

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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

4.80-4.902.55-2.70

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

{010} Indistinct

Indiscernible

1.7 Mohs Hardness

6-6.56.5-7

2 10

1.8 Chemical Composition

FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

SiO₂

Marcasite and Onyx Chemical Formula

While comparing Marcasite and Onyx 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 Marcasite and Onyx chemical formula.

Chemical formula of Marcasite- FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Onyx- SiO₂

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Marcasite and Onyx Specific Gravity

Another important criteria for qualitative analysis of gemstones is Marcasite and Onyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Marcasite and Onyx Optical Properties during the identification of gemstone. Specific gravity of Marcasite is 2.55-2.70 whereas that of Onyx is 2.55-2.70.