Onyx and Dumortierite Physical Properties

Onyx

Dumortierite

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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

2.55-2.703.26-3.41

1 7.18

1.5 Fracture

Not Available

Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references

1.6 Cleavage

Indiscernible

Distinct on {100}, poor on {110}; parting on {001}

1.7 Mohs Hardness

6.5-77-8.5

2 10

1.8 Chemical Composition

SiO₂

AlAl₆O₃BSi₃O₁₈

Onyx and Dumortierite Chemical Formula

While comparing Onyx and Dumortierite 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 Dumortierite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Dumortierite- AlAl₆O₃BSi₃O₁₈

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Onyx and Dumortierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Dumortierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Dumortierite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 3.26-3.41 whereas that of Dumortierite is 3.26-3.41.