Andalusite and Montebrasite Physical Properties

Andalusite

Montebrasite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.05-3.212.98-3.10

1 7.18

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Fracture

Uneven, Subconchoidal, Splintery

Uneven, Conchoidal

Cleavage

Good on {110}, poor on {100}

{100} Perfect, {110} Good, {011} Distinct

Mohs Hardness

7.55.5-6

2 10

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Chemical Composition

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

LiAl(PO 4)(OH,F)Walter Schumann , Gemstones of the world (2001) More from other references

Andalusite and Montebrasite Chemical Formula

While comparing Andalusite and Montebrasite 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 Montebrasite chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Montebrasite- LiAl(PO 4)(OH,F)Walter Schumann , Gemstones of the world (2001) More from other references

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Andalusite and Montebrasite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Montebrasite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Montebrasite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 2.98-3.10 whereas that of Montebrasite is 2.98-3.10.