Onyx and Sard Physical Properties

Onyx

Sard

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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

2.55-2.702.58-2.63

1 7.18

1.5 Fracture

Not Available

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

Indiscernible

Not Available

1.7 Mohs Hardness

6.5-76.5-7

2 10

1.8 Chemical Composition

SiO₂

SiO 2Ulrich Henn and Claudio C.

Onyx and Sard Chemical Formula

While comparing Onyx and Sard 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 Sard chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Sard- SiO 2Ulrich Henn and Claudio C.

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Onyx and Sard Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Sard Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Sard Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.58-2.63 whereas that of Sard is 2.58-2.63.