Hercynite and Andalusite Physical Properties

Hercynite

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

4.393.05-3.21

1 7.18

1.5 Fracture

ConchoidalGemdat.org, Uneven

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

1.6 Cleavage

{111} Indistinct, {111} Indistinct, {111} Indistinct

Good on {110}, poor on {100}

1.7 Mohs Hardness

7.5-87.5

2 10

1.13 Chemical Composition

Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

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

Hercynite and Andalusite Chemical Formula

While comparing Hercynite 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 Hercynite and Andalusite chemical formula.

Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Hercynite and Andalusite Specific Gravity

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