Andalusite and Chalcedony Physical Properties

Andalusite

Chalcedony

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.05-3.21

2.55-2.70

1.5 Fracture

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

Uneven, Splintery, Conchoidal, Uneven, Splintery, Conchoidal, UnevenWalter Schumann

1.6 Cleavage

Good on {110}, poor on {100}

Absent

1.7 Mohs Hardness

7.5

6.5-7

1.8 Chemical Composition

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

SiO₂

Andalusite and Chalcedony Chemical Formula

While comparing Andalusite and Chalcedony 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 Andalusite and Chalcedony chemical formula.

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

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Andalusite and Chalcedony Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Chalcedony Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Chalcedony Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 2.55-2.70 whereas that of Chalcedony is 2.55-2.70.