Alunite and Brookite Physical Properties

Alunite

Brookite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.93.87-4.14

1 7.18

1.5 Fracture

Conchoidal, Uneven

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

1.6 Cleavage

On {0001}, perfect

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

1.7 Mohs Hardness

3.5-45.5-6

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

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

Alunite and Brookite Chemical Formula

While comparing Alunite and Brookite 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 Alunite and Brookite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Brookite- TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Alunite and Brookite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Brookite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Brookite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.87-4.14 whereas that of Brookite is 3.87-4.14.