Onyx and Magnesite Physical Properties

Onyx

Magnesite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Effervesces in hot HCl

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.702.92-3.12

1 7.18

1.5 Fracture

Not Available

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

Indiscernible

[10 1 1] perfect

1.7 Mohs Hardness

6.5-73.5-4.5

2 10

1.8 Chemical Composition

SiO₂

MgCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Onyx and Magnesite Chemical Formula

While comparing Onyx and Magnesite 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 Magnesite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Magnesite- MgCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Onyx and Magnesite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Magnesite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Magnesite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.92-3.12 whereas that of Magnesite is 2.92-3.12.