Onyx and Brucite Physical Properties

Onyx

Brucite

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1 Physical Properties

1.1 Tenacity

Not Available

Sectile

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.70

2.39

1.5 Fracture

Not Available

Irregular

1.6 Cleavage

Indiscernible

Perfect on {0001}

1.7 Mohs Hardness

6.5-7

2.5

1.8 Chemical Composition

SiO₂

Mg(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

Onyx and Brucite Chemical Formula

While comparing Onyx and Brucite 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 Brucite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Brucite- Mg(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

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Onyx and Brucite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Brucite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Brucite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.39 whereas that of Brucite is 2.39.