Onyx and Phenakite Physical Properties

Onyx

Phenakite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.702.90-2.98

1 7.18

1.5 Fracture

Not Available

Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001), Brittle

1.6 Cleavage

Indiscernible

Distinct on {11 2 0}, imperfect on {10 1 1}

1.7 Mohs Hardness

6.5-77.5-8

2 10

1.8 Chemical Composition

SiO₂

Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Onyx and Phenakite Chemical Formula

While comparing Onyx and Phenakite 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 Phenakite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Phenakite- Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Onyx and Phenakite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Phenakite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Phenakite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.90-2.98 whereas that of Phenakite is 2.90-2.98.