Andalusite and Hiddenite Physical Properties

Andalusite

Hiddenite

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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

3.05-3.21

3.15-3.21

1.5 Fracture

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

Gemstones of the world (2001), UnevenWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

Good on {110}, poor on {100}

1,2 prismatic

1.7 Mohs Hardness

7.5

6-7

1.8 Chemical Composition

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

LiAlSi₂O₆

Andalusite and Hiddenite Chemical Formula

While comparing Andalusite and Hiddenite 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 Hiddenite chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Hiddenite- LiAlSi₂O₆

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Andalusite and Hiddenite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Hiddenite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Hiddenite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 3.15-3.21 whereas that of Hiddenite is 3.15-3.21.