Gahnite and Andalusite Physical Properties

Gahnite

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

4.00-4.623.05-3.21

1 7.18

1.5 Fracture

Conchoidal, Uneven

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

1.6 Cleavage

Indistinct parting on [111]

Good on {110}, poor on {100}

1.7 Mohs Hardness

7.5-87.5

2 10

1.8 Chemical Composition

ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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

Gahnite and Andalusite Chemical Formula

While comparing Gahnite 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 Gahnite and Andalusite chemical formula.

Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Compare Blue Gemstones

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Gahnite Vs Howlite

Gahnite and Andalusite Specific Gravity

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