Onyx and Andalusite Physical Properties

Onyx

Andalusite

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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

2.55-2.703.05-3.21

1 7.18

1.5 Fracture

Not Available

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

1.6 Cleavage

Indiscernible

Good on {110}, poor on {100}

1.7 Mohs Hardness

6.5-77.5

2 10

1.8 Chemical Composition

SiO₂

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Onyx and Andalusite Chemical Formula

While comparing Onyx and Andalusite 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 Andalusite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Onyx and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.