Onyx and Fayalite Physical Properties

Onyx

Fayalite

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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

2.55-2.704.392

1 7.18

1.5 Fracture

Not Available

Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

1.6 Cleavage

Indiscernible

{010} moderate, {100} imperfect

1.7 Mohs Hardness

6.5-76.5-7

2 10

1.8 Chemical Composition

SiO₂

Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)

Onyx and Fayalite Chemical Formula

While comparing Onyx and Fayalite 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 Fayalite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Fayalite- Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Onyx and Fayalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Fayalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Fayalite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 4.392 whereas that of Fayalite is 4.392.