Brookite and Andalusite Physical Properties

Brookite

Andalusite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.87-4.143.05-3.21

1 7.18

1.5 Fracture

Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

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

1.6 Cleavage

Poor on {120}, in traces on {001}

Good on {110}, poor on {100}

1.7 Mohs Hardness

5.5-67.5

2 10

1.8 Chemical Composition

TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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

Brookite and Andalusite Chemical Formula

While comparing Brookite 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 Brookite and Andalusite chemical formula.

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

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Brookite and Andalusite Specific Gravity

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