Onyx and Marcasite Physical Properties

Onyx

Marcasite

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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

2.55-2.704.80-4.90

1 7.18

1.5 Fracture

Not Available

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

1.6 Cleavage

Indiscernible

{010} Indistinct

1.7 Mohs Hardness

6.5-76-6.5

2 10

1.8 Chemical Composition

SiO₂

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

Onyx and Marcasite Chemical Formula

While comparing Onyx and Marcasite 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 Marcasite chemical formula.

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

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Onyx and Marcasite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Marcasite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Marcasite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 4.80-4.90 whereas that of Marcasite is 4.80-4.90.