Onyx and Periclase Physical Properties

Onyx

Periclase

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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

2.55-2.703.7-3.9

1 7.18

1.5 Fracture

Not Available

Conchoidal, Brittle

1.6 Cleavage

Indiscernible

{001} perfect; {111} imperfect, may exhibit parting on , {011}

1.7 Mohs Hardness

6.5-75.5-6

2 10

1.8 Chemical Composition

SiO₂

MgOMichael OâDonoghue , Gems, Sixth Edition (2006)

Onyx and Periclase Chemical Formula

While comparing Onyx and Periclase 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 Periclase chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Periclase- MgOMichael OâDonoghue , Gems, Sixth Edition (2006)

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Onyx and Periclase Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Periclase Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Periclase Optical Properties during the identification of gemstone. Specific gravity of Onyx is 3.7-3.9 whereas that of Periclase is 3.7-3.9.