Andalusite and Danburite Physical Properties

Andalusite

Danburite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.05-3.212.97-3.03

1 7.18

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Fracture

Uneven, Subconchoidal, Splintery

Uneven, ConchoidalWalter Schumann, Conchoidal

Cleavage

Good on {110}, poor on {100}

{001} Poor

Mohs Hardness

7.57

2 10

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Chemical Composition

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

CaB 2(SiO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Andalusite and Danburite Chemical Formula

While comparing Andalusite and Danburite 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 Danburite chemical formula.

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

Compare Brown Gemstones

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Andalusite and Danburite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Danburite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Danburite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 2.97-3.03 whereas that of Danburite is 2.97-3.03.